feat: Enhance Swagger documentation with new admin and user endpoints

- Added definitions for admin authentication, media, posts, orders, and user management.
- Implemented new API paths for admin functionalities including authentication, media management, order processing, and user statistics.
- Updated existing endpoints to improve clarity and structure in the Swagger documentation.
- Introduced new response schemas for various operations to standardize API responses.

backend_v1/app/http/admin/statistics.go

@@ -22,7 +22,11 @@ type StatisticsResponse struct {
 
 // dashboard statistics
 //
-//	@Router	/admin/statistics [get]
+//	@Summary		仪表盘统计
+//	@Tags			Admin Statistics
+//	@Produce		json
+//	@Success		200	{object}	StatisticsResponse	"成功"
+//	@Router			/admin/statistics [get]
 func (s *statistics) statistics(ctx fiber.Ctx) (*StatisticsResponse, error) {
 	statistics := &StatisticsResponse{}