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/browser_extension.go

@@ -0,0 +1,33 @@
+package models
+
+import (
+	"time"
+)
+
+// APIKey represents an API key for browser extension
+type APIKey struct {
+	ID          uint      `json:"id" gorm:"primaryKey"`
+	Name        string    `json:"name" gorm:"not null"`
+	Key         string    `json:"key" gorm:"not null;uniqueIndex"`
+	UserID      uint      `json:"user_id" gorm:"not null"`
+	Permissions []string  `json:"permissions" gorm:"serializer:json"`
+	IsActive    bool      `json:"is_active" gorm:"default:true"`
+	LastUsed    *time.Time `json:"last_used,omitempty" gorm:"not null"`
+	CreatedAt   time.Time `json:"created_at" gorm:"autoCreateTime"`
+	UpdatedAt   time.Time `json:"updated_at" gorm:"autoUpdateTime"`
+	ExpiresAt   *time.Time `json:"expires_at,omitempty" gorm:"not null"`
+	User        User      `json:"user,omitempty" gorm:"foreignKey:UserID"`
+}
+
+// BrowserExtension represents a browser extension registration
+type BrowserExtension struct {
+	ID           uint      `json:"id" gorm:"primaryKey"`
+	UserID       uint      `json:"user_id" gorm:"not null"`
+	ExtensionID  string    `json:"extension_id" gorm:"not null"`
+	Name         string    `json:"name" gorm:"not null"`
+	IsActive     bool      `json:"is_active" gorm:"default:true"`
+	LastSeen     *time.Time `json:"last_seen,omitempty" gorm:"not null"`
+	CreatedAt     time.Time `json:"created_at" gorm:"autoCreateTime"`
+	UpdatedAt     time.Time `json:"updated_at" gorm:"autoUpdateTime"`
+	User         User      `json:"user,omitempty" gorm:"foreignKey:UserID"`
+}