fix: DSPY格式统一为Python脚本+json.dumps,消除JSON格式导致的NoneType异常

wwwroot/api/currency_stats.dspy

@@ -1,7 +1,4 @@
-{
-    "python": {
-        "method": "get",
-        "import": "sage_datamart.init",
-        "call": "api_currency_stats"
-    }
-}
+# 币种分布 API
+import json
+data = await api_currency_stats(request)
+return json.dumps(data, ensure_ascii=False)

wwwroot/api/distributor_customers.dspy

@@ -1 +1,4 @@
-return await api_distributor_customers(request)
+# 分销商客户排行 API
+import json
+data = await api_distributor_customers(request)
+return json.dumps(data, ensure_ascii=False)

wwwroot/api/realtime_cards.dspy

@@ -1 +1,4 @@
-return await api_realtime_cards(request)
+# 实时统计卡片 API
+import json
+data = await api_realtime_cards(request)
+return json.dumps(data, ensure_ascii=False)