feat(api): implement exam and grade synchronization modules

Add new functionality for managing and synchronizing academic grades and exam schedules. This includes new models, repositories, services, and HTTP handlers, along with updated gRPC definitions and dependency injection configuration.

Additionally, improve the reliability of unread message count tracking by implementing an atomic Lua script for Redis operations in the conversation cache.

internal/wire/handler.go

@@ -35,6 +35,8 @@ var HandlerSet = wire.NewSet(
 	handler.NewAdminProfileAuditHandler,
 	handler.NewPostHandler,
 	handler.NewTradeHandler,
+	handler.NewGradeHandler,
+	handler.NewExamHandler,
 
 	// 需要特殊处理的 Handler
 	ProvideUserHandler,