feat: Enhance dependency injection and service integration

- Updated main.go to initialize email service and include it in the dependency injection container.
- Refactored handlers to utilize context in service method calls, improving consistency and error handling.
- Introduced new service options for upload, security, and captcha services, enhancing modularity and testability.
- Removed unused repository implementations to streamline the codebase.

This commit continues the effort to improve the architecture by ensuring all services are properly injected and utilized across the application.

internal/service/mocks_test.go

@@ -2,7 +2,9 @@ package service
 
 import (
 	"carrotskin/internal/model"
+	"carrotskin/pkg/database"
 	"errors"
+	"time"
 )
 
 // ============================================================================
@@ -962,3 +964,17 @@ func (m *MockTokenService) GetUserIDByAccessToken(accessToken string) (int64, er
 	}
 	return 0, errors.New("token not found")
 }
+
+// ============================================================================
+// CacheManager Mock - uses database.CacheManager with nil redis
+// ============================================================================
+
+// NewMockCacheManager 创建一个禁用的 CacheManager 用于测试
+// 通过设置 Enabled = false，缓存操作会被跳过，测试不依赖 Redis
+func NewMockCacheManager() *database.CacheManager {
+	return database.NewCacheManager(nil, database.CacheConfig{
+		Prefix:     "test:",
+		Expiration: 5 * time.Minute,
+		Enabled:    false, // 禁用缓存，测试不依赖 Redis
+	})
+}