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/service.go

@@ -3,6 +3,7 @@ package wire
 import (
 	"carrot_bbs/internal/cache"
 	"carrot_bbs/internal/config"
+	"carrot_bbs/internal/grpc/runner"
 	"carrot_bbs/internal/pkg/email"
 	"carrot_bbs/internal/pkg/gorse"
 	"carrot_bbs/internal/pkg/openai"
@@ -12,6 +13,7 @@ import (
 	"carrot_bbs/internal/service"
 
 	"github.com/google/wire"
+	"go.uber.org/zap"
 	"gorm.io/gorm"
 )
 
@@ -36,6 +38,7 @@ var ServiceSet = wire.NewSet(
 	ProvideVoteService,
 	ProvideChatService,
 	ProvideScheduleService,
+	ProvideScheduleSyncService,
 	ProvideGroupService,
 	ProvideUploadService,
 )
@@ -168,6 +171,15 @@ func ProvideScheduleService(
 	return service.NewScheduleService(scheduleRepo)
 }
 
+// ProvideScheduleSyncService 提供课表同步服务
+func ProvideScheduleSyncService(
+	taskManager *runner.TaskManager,
+	scheduleRepo repository.ScheduleRepository,
+	logger *zap.Logger,
+) service.ScheduleSyncService {
+	return service.NewScheduleSyncService(taskManager, scheduleRepo, logger)
+}
+
 // ProvideGroupService 提供群组服务
 func ProvideGroupService(
 	db *gorm.DB,