feat: major feature updates and cleanup

- Add Redis architecture implementation
- Update browser extension functionality
- Clean up deprecated files and documentation
- Enhance backend handlers for auth, messages, search
- Add new configuration options and settings
- Update Docker and deployment configurations

backend/models/search_settings.go

@@ -0,0 +1,65 @@
+package models
+
+import (
+	"time"
+
+	"gorm.io/gorm"
+)
+
+// UserSearchSettings stores user-specific search API configurations
+type UserSearchSettings struct {
+	ID        uint           `json:"id" gorm:"primaryKey"`
+	CreatedAt time.Time      `json:"created_at"`
+	UpdatedAt time.Time      `json:"updated_at"`
+	DeletedAt gorm.DeletedAt `json:"-" gorm:"index"`
+
+	UserID uint `json:"user_id" gorm:"not null;uniqueIndex"`
+	User   User `json:"user,omitempty" gorm:"foreignKey:UserID"`
+
+	// Brave Search Settings
+	BraveAPIKey        string `json:"-" gorm:"column:brave_api_key"` // Encrypted
+	BraveSearchBaseURL string `json:"brave_search_base_url" gorm:"default:https://api.search.brave.com/res/v1/web/search"`
+
+	// Serper (Google) Search Settings
+	SerperAPIKey  string `json:"-" gorm:"column:serper_api_key"` // Encrypted
+	SerperBaseURL string `json:"serper_base_url" gorm:"default:https://google.serper.dev/search"`
+
+	// Search Configuration
+	SearchAPIProvider  string `json:"search_api_provider" gorm:"default:brave"` // brave, serper
+	SearchResultsLimit int    `json:"search_results_limit" gorm:"default:10"`
+	SearchCacheTTL     int    `json:"search_cache_ttl" gorm:"default:300"`  // seconds
+	SearchRateLimit    int    `json:"search_rate_limit" gorm:"default:100"` // requests per minute
+}
+
+// GetUserSearchSettings retrieves search settings for a user
+func GetUserSearchSettings(userID uint) (*UserSearchSettings, error) {
+	var settings UserSearchSettings
+	err := DB.Where("user_id = ?", userID).First(&settings).Error
+	if err != nil {
+		if err == gorm.ErrRecordNotFound {
+			// Create default settings
+			settings = UserSearchSettings{
+				UserID:             userID,
+				BraveSearchBaseURL: "https://api.search.brave.com/res/v1/web/search",
+				SerperBaseURL:      "https://google.serper.dev/search",
+				SearchAPIProvider:  "brave",
+				SearchResultsLimit: 10,
+				SearchCacheTTL:     300,
+				SearchRateLimit:    100,
+			}
+			// Save defaults
+			if err := DB.Create(&settings).Error; err != nil {
+				return nil, err
+			}
+			return &settings, nil
+		}
+		return nil, err
+	}
+	return &settings, nil
+}
+
+// SaveUserSearchSettings saves search settings for a user
+func SaveUserSearchSettings(userID uint, settings *UserSearchSettings) error {
+	settings.UserID = userID
+	return DB.Where("user_id = ?", userID).Assign(settings).FirstOrCreate(settings).Error
+}