refactor: use RefreshWidget for stat cards + fix .dspy import violations

Architecture:
- index.ui: title + RefreshWidget(cards) + ChartBar with refresh_period
- RefreshWidget wraps dashboard_cards.dspy → returns full card widget tree
  with live data (cnt, amount, total_users, concurrent_users)
- ChartBar handles its own auto-refresh via refresh_period: 10
- No more JS polling file needed

.dspy import fixes:
- get_today_usage.dspy: remove import json, from datetime import date
- get_user_stats.dspy: remove from datetime import datetime, timedelta
- get_top_models.dspy: remove from datetime import date
- All use pre-loaded datetime module (datetime.date.today(), etc.)
- dashboard_cards.dspy: same pattern, no imports

Permission:
- load_path.py: add dashboard_cards.dspy logined

wwwroot/api/dashboard_cards.dspy

@@ -0,0 +1,73 @@
+"""获取当天llmusage笔数和交易金额 + 用户统计 — 返回完整卡片widget树供RefreshWidget加载"""
+# datetime, json, DBPools 由 ahserver 预加载，无需 import
+
+today = datetime.date.today().isoformat()
+now = datetime.datetime.now()
+five_min_ago = (now - datetime.timedelta(minutes=5)).strftime('%Y-%m-%d %H:%M:%S')
+
+db = DBPools()
+
+# 今日用量
+async with db.sqlorContext('sage') as sor:
+    recs = await sor.sqlExe(
+        "SELECT COUNT(*) as cnt, COALESCE(SUM(amount), 0) as total_amount FROM llmusage WHERE use_date = ${today}$",
+        {'today': today}
+    )
+    cnt = int(recs[0].get('cnt', 0)) if recs else 0
+    total_amount = float(recs[0].get('total_amount', 0)) if recs else 0.0
+
+# 总用户数
+async with db.sqlorContext('sage') as sor:
+    user_recs = await sor.sqlExe("SELECT COUNT(*) as total_users FROM users", {})
+    total_users = int(user_recs[0].get('total_users', 0)) if user_recs else 0
+
+# 并发用户
+async with db.sqlorContext('sage') as sor:
+    conc = await sor.sqlExe(
+        "SELECT COUNT(DISTINCT userid) as concurrent_users FROM llmusage WHERE use_date = ${today}$ AND use_time >= ${five_min_ago}$",
+        {'today': today, 'five_min_ago': five_min_ago}
+    )
+    concurrent_users = int(conc[0].get('concurrent_users', 0)) if conc else 0
+
+return {
+    "widgettype": "ResponsableBox",
+    "options": {"gap": "16px", "minWidth": "250px"},
+    "subwidgets": [
+        {
+            "widgettype": "VBox",
+            "id": "card_today_cnt",
+            "options": {"bgcolor": "#FFFFFF", "padding": "24px", "borderRadius": "8px", "flex": "1", "minHeight": "120px", "boxShadow": "0 2px 8px rgba(0,0,0,0.1)"},
+            "subwidgets": [
+                {"widgettype": "Text", "options": {"text": "今日调用笔数", "fontSize": "14px", "color": "#888", "marginBottom": "8px"}},
+                {"widgettype": "Text", "id": "today_cnt_value", "options": {"text": str(cnt), "fontSize": "32px", "fontWeight": "bold", "color": "#1890ff"}}
+            ]
+        },
+        {
+            "widgettype": "VBox",
+            "id": "card_today_amount",
+            "options": {"bgcolor": "#FFFFFF", "padding": "24px", "borderRadius": "8px", "flex": "1", "minHeight": "120px", "boxShadow": "0 2px 8px rgba(0,0,0,0.1)"},
+            "subwidgets": [
+                {"widgettype": "Text", "options": {"text": "今日交易金额", "fontSize": "14px", "color": "#888", "marginBottom": "8px"}},
+                {"widgettype": "Text", "id": "today_amount_value", "options": {"text": "\u00a5%.2f" % total_amount, "fontSize": "32px", "fontWeight": "bold", "color": "#52c41a"}}
+            ]
+        },
+        {
+            "widgettype": "VBox",
+            "id": "card_total_users",
+            "options": {"bgcolor": "#FFFFFF", "padding": "24px", "borderRadius": "8px", "flex": "1", "minHeight": "120px", "boxShadow": "0 2px 8px rgba(0,0,0,0.1)"},
+            "subwidgets": [
+                {"widgettype": "Text", "options": {"text": "用户总数", "fontSize": "14px", "color": "#888", "marginBottom": "8px"}},
+                {"widgettype": "Text", "id": "total_users_value", "options": {"text": str(total_users), "fontSize": "32px", "fontWeight": "bold", "color": "#722ed1"}}
+            ]
+        },
+        {
+            "widgettype": "VBox",
+            "id": "card_concurrent_users",
+            "options": {"bgcolor": "#FFFFFF", "padding": "24px", "borderRadius": "8px", "flex": "1", "minHeight": "120px", "boxShadow": "0 2px 8px rgba(0,0,0,0.1)"},
+            "subwidgets": [
+                {"widgettype": "Text", "options": {"text": "当前并发用户", "fontSize": "14px", "color": "#888", "marginBottom": "8px"}},
+                {"widgettype": "Text", "id": "concurrent_users_value", "options": {"text": str(concurrent_users), "fontSize": "32px", "fontWeight": "bold", "color": "#fa8c16"}}
+            ]
+        }
+    ]
+}

wwwroot/api/dashboard_content.dspy

@@ -1,100 +0,0 @@
-"""返回 dashboard 动态 UI 描述（含实时数据）"""
-from datetime import date, datetime, timedelta
-
-db = DBPools()
-today = date.today().isoformat()
-now = datetime.now()
-five_min_ago = (now - timedelta(minutes=5)).strftime('%Y-%m-%d %H:%M:%S')
-
-# 今日用量
-async with db.sqlorContext('sage') as sor:
-    usage = await sor.sqlExe(
-        "SELECT COUNT(*) as cnt, COALESCE(SUM(amount), 0) as total_amount FROM llmusage WHERE use_date = ${today}$",
-        {'today': today}
-    )
-    cnt = int(usage[0]['cnt']) if usage else 0
-    total_amount = float(usage[0]['total_amount']) if usage else 0.0
-
-# 总用户数
-async with db.sqlorContext('sage') as sor:
-    users = await sor.sqlExe("SELECT COUNT(*) as total_users FROM users", {})
-    total_users = int(users[0]['total_users']) if users else 0
-
-# 并发用户
-async with db.sqlorContext('sage') as sor:
-    conc = await sor.sqlExe(
-        "SELECT COUNT(DISTINCT userid) as concurrent_users FROM llmusage WHERE use_date = ${today}$ AND use_time >= ${five_min_ago}$",
-        {'today': today, 'five_min_ago': five_min_ago}
-    )
-    concurrent_users = int(conc[0]['concurrent_users']) if conc else 0
-
-# ChartBar data_url — 用相对路径，bricks 会基于当前上下文解析
-chart_data_url = 'api/get_top_models.dspy'
-
-return {
-    "widgettype": "VBox",
-    "options": {"width": "100%"},
-    "subwidgets": [
-        {
-            "widgettype": "ResponsableBox",
-            "options": {"gap": "16px", "minWidth": "250px"},
-            "subwidgets": [
-                {
-                    "widgettype": "VBox",
-                    "id": "card_today_cnt",
-                    "options": {"bgcolor": "#FFFFFF", "padding": "24px", "borderRadius": "8px", "flex": "1", "minHeight": "120px", "boxShadow": "0 2px 8px rgba(0,0,0,0.1)"},
-                    "subwidgets": [
-                        {"widgettype": "Text", "options": {"text": "今日调用笔数", "fontSize": "14px", "color": "#888", "marginBottom": "8px"}},
-                        {"widgettype": "Text", "id": "today_cnt_value", "options": {"text": str(cnt), "fontSize": "32px", "fontWeight": "bold", "color": "#1890ff"}}
-                    ]
-                },
-                {
-                    "widgettype": "VBox",
-                    "id": "card_today_amount",
-                    "options": {"bgcolor": "#FFFFFF", "padding": "24px", "borderRadius": "8px", "flex": "1", "minHeight": "120px", "boxShadow": "0 2px 8px rgba(0,0,0,0.1)"},
-                    "subwidgets": [
-                        {"widgettype": "Text", "options": {"text": "今日交易金额", "fontSize": "14px", "color": "#888", "marginBottom": "8px"}},
-                        {"widgettype": "Text", "id": "today_amount_value", "options": {"text": f"\u00a5{total_amount:.2f}", "fontSize": "32px", "fontWeight": "bold", "color": "#52c41a"}}
-                    ]
-                },
-                {
-                    "widgettype": "VBox",
-                    "id": "card_total_users",
-                    "options": {"bgcolor": "#FFFFFF", "padding": "24px", "borderRadius": "8px", "flex": "1", "minHeight": "120px", "boxShadow": "0 2px 8px rgba(0,0,0,0.1)"},
-                    "subwidgets": [
-                        {"widgettype": "Text", "options": {"text": "用户总数", "fontSize": "14px", "color": "#888", "marginBottom": "8px"}},
-                        {"widgettype": "Text", "id": "total_users_value", "options": {"text": str(total_users), "fontSize": "32px", "fontWeight": "bold", "color": "#722ed1"}}
-                    ]
-                },
-                {
-                    "widgettype": "VBox",
-                    "id": "card_concurrent_users",
-                    "options": {"bgcolor": "#FFFFFF", "padding": "24px", "borderRadius": "8px", "flex": "1", "minHeight": "120px", "boxShadow": "0 2px 8px rgba(0,0,0,0.1)"},
-                    "subwidgets": [
-                        {"widgettype": "Text", "options": {"text": "当前并发用户", "fontSize": "14px", "color": "#888", "marginBottom": "8px"}},
-                        {"widgettype": "Text", "id": "concurrent_users_value", "options": {"text": str(concurrent_users), "fontSize": "32px", "fontWeight": "bold", "color": "#fa8c16"}}
-                    ]
-                }
-            ]
-        },
-        {
-            "widgettype": "VBox",
-            "id": "chart_section",
-            "options": {"bgcolor": "#FFFFFF", "padding": "24px", "borderRadius": "8px", "marginTop": "20px", "minHeight": "350px", "boxShadow": "0 2px 8px rgba(0,0,0,0.1)"},
-            "subwidgets": [
-                {"widgettype": "Text", "options": {"text": "Top 3 模型（今日）", "fontSize": "18px", "fontWeight": "bold", "color": "#333", "marginBottom": "16px"}},
-                {
-                    "widgettype": "ChartBar",
-                    "id": "top_models_chart",
-                    "options": {
-                        "height": "300px",
-                        "width": "100%",
-                        "data_url": chart_data_url,
-                        "nameField": "model_name",
-                        "valueFields": ["cnt", "total_amount"]
-                    }
-                }
-            ]
-        }
-    ]
-}

wwwroot/api/get_today_usage.dspy

@@ -1,8 +1,7 @@
 """获取当天llmusage笔数和交易金额"""
-import json
+# datetime, json, DBPools 由 ahserver 预加载，无需 import
-from datetime import date
 
-ns = params_kw.copy()
+today = datetime.date.today().isoformat()
 
 sql = """
 SELECT 
@@ -12,7 +11,6 @@ FROM llmusage
 WHERE use_date = ${today}$
 """
 
-today = date.today().isoformat()
 db = DBPools()
 async with db.sqlorContext('sage') as sor:
     recs = await sor.sqlExe(sql, {'today': today})

wwwroot/api/get_top_models.dspy

@@ -1,8 +1,7 @@
 """获取当天排名前三的模型数量和金额"""
-from datetime import date
+# datetime, json, DBPools 由 ahserver 预加载，无需 import
 
-ns = params_kw.copy()
+today = datetime.date.today().isoformat()
-today = date.today().isoformat()
 
 sql = """
 SELECT 

wwwroot/api/get_user_stats.dspy

@@ -1,17 +1,12 @@
 """获取当前用户总数和并发用户数（近5分钟有活跃记录的用户）"""
-from datetime import datetime, timedelta
+# datetime, json, DBPools 由 ahserver 预加载，无需 import
 
-ns = params_kw.copy()
+now = datetime.datetime.now()
-db = DBPools()
+five_min_ago = (now - datetime.timedelta(minutes=5)).strftime('%Y-%m-%d %H:%M:%S')
-
-# 总用户数
-sql_users = "SELECT COUNT(*) as total_users FROM users"
-
-# 并发用户数：近5分钟内在llmusage中有记录的不同用户
-now = datetime.now()
-five_min_ago = (now - timedelta(minutes=5)).strftime('%Y-%m-%d %H:%M:%S')
 today = now.strftime('%Y-%m-%d')
 
+sql_users = "SELECT COUNT(*) as total_users FROM users"
+
 sql_concurrent = """
 SELECT COUNT(DISTINCT userid) as concurrent_users 
 FROM llmusage 
@@ -19,6 +14,7 @@ WHERE use_date = ${today}$
   AND use_time >= ${five_min_ago}$
 """
 
+db = DBPools()
 async with db.sqlorContext('sage') as sor:
     user_recs = await sor.sqlExe(sql_users, {})
     total_users = int(user_recs[0].get('total_users', 0)) if user_recs else 0

wwwroot/index.ui

@@ -19,11 +19,47 @@
         },
         {
             "widgettype": "RefreshWidget",
-            "id": "dashboard_refresh",
+            "id": "cards_refresh",
             "options": {
                 "period_seconds": 10,
-                "url": "{{entire_url('api/dashboard_content.dspy')}}"
+                "url": "{{entire_url('api/dashboard_cards.dspy')}}"
+            }
+        },
+        {
+            "widgettype": "VBox",
+            "id": "chart_section",
+            "options": {
+                "bgcolor": "#FFFFFF",
+                "padding": "24px",
+                "borderRadius": "8px",
+                "marginTop": "20px",
+                "minHeight": "350px",
+                "boxShadow": "0 2px 8px rgba(0,0,0,0.1)"
+            },
+            "subwidgets": [
+                {
+                    "widgettype": "Text",
+                    "options": {
+                        "text": "Top 3 模型（今日）",
+                        "fontSize": "18px",
+                        "fontWeight": "bold",
+                        "color": "#333",
+                        "marginBottom": "16px"
+                    }
+                },
+                {
+                    "widgettype": "ChartBar",
+                    "id": "top_models_chart",
+                    "options": {
+                        "height": "300px",
+                        "width": "100%",
+                        "data_url": "{{entire_url('api/get_top_models.dspy')}}",
+                        "nameField": "model_name",
+                        "valueFields": ["cnt", "total_amount"],
+                        "refresh_period": 10
                     }
                 }
             ]
+        }
+    ]
 }