Integrate WeChat Official Account support and update configuration

- Added WeChat Official Account configuration options to .env.example and config.go for OAuth2 integration.
- Updated main.go to initialize WeChat OAuth handler and register routes for handling OAuth requests.
- Enhanced documentation to include references for WeChat Official Account functionality.
- Updated route registration to accommodate the new OAuth handler for improved API structure.

cmd/api/main.go

@@ -10,6 +10,8 @@ import (
 	authservice "wx_service/internal/common/auth/service"
 	qiniuhandler "wx_service/internal/common/qiniu/handler"
 	qiniuservice "wx_service/internal/common/qiniu/service"
+	oahandler "wx_service/internal/common/wechat_official/handler"
+	oaservice "wx_service/internal/common/wechat_official/service"
 	"wx_service/internal/database"
 	"wx_service/internal/model"
 	rmhandler "wx_service/internal/remove_watermark/handler"
@@ -60,8 +62,11 @@ func main() {
 	qiniuService := qiniuservice.NewQiniuService(config.AppConfig.Qiniu)
 	uploadHandler := qiniuhandler.NewUploadHandler(qiniuService)
 
+	oaService := oaservice.NewWeChatOAService(config.AppConfig.WeChatOA)
+	oaOAuthHandler := oahandler.NewOAuthHandler(oaService)
+
 	// 6) 注册路由：把 URL 映射到 handler
-	routes.Register(router, database.DB, authHandler, videoHandler, smokeHandler, uploadHandler)
+	routes.Register(router, database.DB, authHandler, videoHandler, smokeHandler, uploadHandler, oaOAuthHandler)
 
 	// 7) 启动监听端口
 	addr := ":" + config.AppConfig.Server.Port