feat: Add Popup and PopupWindow examples and update chat interface

- Add comprehensive examples for Popup.ui and PopupWindow.ui components
- Update chat.ui to use PopupWindow for better desktop-like experience
- PopupWindow provides draggable, resizable application windows with title bar
- Popup provides modal/non-modal popup layers with auto-dismiss support
- Both components support proper event handling and lifecycle management
- Examples demonstrate real-world usage patterns for hermes-web-cli module

examples/Popup.ui

@@ -0,0 +1,71 @@
+{
+  "widgettype": "Popup",
+  "options": {
+    "title": "弹出层示例",
+    "width": "400px",
+    "height": "300px",
+    "auto_open": true,
+    "modal": true,
+    "movable": true,
+    "resizable": false
+  },
+  "subwidgets": [
+    {
+      "widgettype": "Text",
+      "options": {
+        "text": "这是一个 Popup 弹出层",
+        "fontSize": "18px"
+      }
+    },
+    {
+      "widgettype": "Form",
+      "options": {
+        "fields": [
+          {
+            "name": "message",
+            "label": "消息内容",
+            "uitype": "text"
+          }
+        ]
+      }
+    },
+    {
+      "widgettype": "HBox",
+      "subwidgets": [
+        {
+          "widgettype": "Filler"
+        },
+        {
+          "widgettype": "Button",
+          "options": {
+            "text": "确定"
+          },
+          "binds": [
+            {
+              "wid": "self",
+              "event": "click",
+              "actiontype": "method",
+              "target": "-@Popup",
+              "method": "dismiss"
+            }
+          ]
+        },
+        {
+          "widgettype": "Button",
+          "options": {
+            "text": "取消"
+          },
+          "binds": [
+            {
+              "wid": "self",
+              "event": "click",
+              "actiontype": "method",
+              "target": "-@Popup",
+              "method": "dismiss"
+            }
+          ]
+        }
+      ]
+    }
+  ]
+}

examples/PopupWindow.ui

@@ -0,0 +1,64 @@
+{
+  "widgettype": "PopupWindow",
+  "options": {
+    "title": "应用窗口示例",
+    "width": "600px",
+    "height": "400px",
+    "auto_open": true,
+    "movable": true,
+    "resizable": true,
+    "modal": false
+  },
+  "subwidgets": [
+    {
+      "widgettype": "VBox",
+      "options": {
+        "width": "100%",
+        "height": "100%"
+      },
+      "subwidgets": [
+        {
+          "widgettype": "Text",
+          "options": {
+            "text": "这是一个可拖拽、可调整大小的应用窗口",
+            "fontSize": "20px"
+          }
+        },
+        {
+          "widgettype": "TabPanel",
+          "options": {
+            "tab_pos": "top",
+            "items": [
+              {
+                "name": "tab1",
+                "label": "内容1",
+                "content": {
+                  "widgettype": "Text",
+                  "options": {
+                    "text": "第一个标签页的内容"
+                  }
+                }
+              },
+              {
+                "name": "tab2",
+                "label": "内容2", 
+                "content": {
+                  "widgettype": "Form",
+                  "options": {
+                    "fields": [
+                      {
+                        "name": "input1",
+                        "label": "输入框",
+                        "uitype": "str"
+                      }
+                    ]
+                  }
+                }
+              }
+            ]
+          }
+        }
+      ]
+    }
+  ]
+}

wwwroot/chat.ui

@@ -1,3 +1,15 @@
+{
+  "widgettype": "PopupWindow",
+  "options": {
+    "title": "{{params_kw.get('service_name')}} - {{params_kw.get('session_name')}}",
+    "width": "800px",
+    "height": "600px",
+    "auto_open": true,
+    "movable": true,
+    "resizable": true,
+    "modal": false
+  },
+  "subwidgets": [
     {
       "widgettype": "VBox",
       "options": {
@@ -5,39 +17,6 @@
         "height": "100%"
       },
       "subwidgets": [
-    {
-      "widgettype": "HBox",
-      "options": {
-        "height": "60px"
-      },
-      "subwidgets": [
-        {
-          "widgettype": "Text",
-          "options": {
-            "text": "{{params_kw.get('service_name')}} - {{params_kw.get('session_name')}}",
-            "fontSize": "20px"
-          }
-        },
-        {
-          "widgettype": "Filler"
-        },
-        {
-          "widgettype": "Button",
-          "options": {
-            "text": "关闭会话"
-          },
-          "binds": [
-            {
-              "wid": "self",
-              "event": "click",
-              "actiontype": "method",
-              "target": "-@Modal",
-              "method": "dismiss"
-            }
-          ]
-        }
-      ]
-    },
         {
           "widgettype": "Filler",
           "subwidgets": [
@@ -76,3 +55,5 @@
         }
       ]
     }
+  ]
+}