feat(grpc): add gRPC server infrastructure and schedule sync service

Add gRPC server support with configurable TLS, environment-based settings, and Wire injection. Implement schedule synchronization service with task runner integration for external course data fetching.

- Add gRPC configuration with env var overrides (APP_GRPC_ENABLED, APP_GRPC_PORT, etc.)
- Create gRPC server infrastructure with runner task management
- Implement ScheduleSyncService for course data synchronization
- Add sync endpoint to schedule handler for external system integration
- Update repository with context-aware batch delete operation
- Wire all dependencies including zap logger for structured logging

internal/wire/infrastructure.go

@@ -16,6 +16,7 @@ import (
 	"carrot_bbs/internal/repository"
 
 	"github.com/google/wire"
+	"go.uber.org/zap"
 	"gorm.io/gorm"
 )
 
@@ -24,6 +25,9 @@ var InfrastructureSet = wire.NewSet(
 	// 配置
 	ProvideConfig,
 
+	// 日志
+	ProvideLogger,
+
 	// 数据库
 	ProvideDB,
 
@@ -119,3 +123,12 @@ func ProvideS3Client(cfg *config.Config) (*s3.Client, error) {
 func ProvideTransactionManager(db *gorm.DB) repository.TransactionManager {
 	return repository.NewTransactionManager(db)
 }
+
+// ProvideLogger 提供 Zap Logger
+func ProvideLogger() *zap.Logger {
+	logger, err := zap.NewProduction()
+	if err != nil {
+		log.Fatalf("Failed to create logger: %v", err)
+	}
+	return logger
+}