feat: add WeChat MP channel support and enhance widget configuration

- Updated output path for generated enums to reflect new structure.
- Enhanced ChannelController to handle WeChat MP OAuth authorization and callback.
- Introduced WechatMPChannelConfig DTO for WeChat MP specific configurations.
- Modified WidgetConfigResponse to include channel type and external source.
- Added enums for WeChat MP channel type and external source.
- Implemented OAuth flow for WeChat MP, including state signing and verification.
- Updated frontend forms to accommodate WeChat MP configurations.
- Enhanced API interactions to support WeChat MP external ID and source.
- Updated generated enums to include WeChat MP external source.

internal/pkg/dto/response/widget_response.go

@@ -1,10 +1,12 @@
 package response
 
 type WidgetConfigResponse struct {
-	ChannelID  string `json:"channelId"`
-	Title      string `json:"title"`
-	Subtitle   string `json:"subtitle"`
-	ThemeColor string `json:"themeColor"`
-	Position   string `json:"position"`
-	Width      string `json:"width"`
+	ChannelID      string `json:"channelId"`
+	ChannelType    string `json:"channelType"`
+	ExternalSource string `json:"externalSource"`
+	Title          string `json:"title"`
+	Subtitle       string `json:"subtitle"`
+	ThemeColor     string `json:"themeColor"`
+	Position       string `json:"position"`
+	Width          string `json:"width"`
 }