feat(material): add material handling and routing functionality

- Introduced MaterialHandler for managing learning materials and subjects.
- Updated router to include routes for public and admin material management.
- Enhanced database initialization with material subject and file models.
- Implemented seeding logic for material subjects and files.
- Updated wire generation to include MaterialHandler and related services.

internal/wire/handler.go

@@ -28,6 +28,7 @@ var HandlerSet = wire.NewSet(
 	handler.NewAdminDashboardHandler,
 	handler.NewAdminLogHandler,
 	handler.NewQRCodeHandler,
+	handler.NewMaterialHandler,
 
 	// 需要特殊处理的 Handler
 	ProvideUserHandler,