chore: Update Documentation

docs/ARCHITECTURE-OVERVIEW.md

@@ -240,12 +240,21 @@ Features are **self-contained modules** within the backend service at `backend/s
 
 ```
 backend/src/features/
-├── vehicles/          # Vehicle management
-├── fuel-logs/         # Fuel tracking
-├── maintenance/       # Service records
-├── stations/          # Gas station locations
+├── admin/             # Admin role management
+├── auth/              # User authentication
+├── backup/            # Database backup/restore
 ├── documents/         # Document storage
-└── platform/          # Vehicle data + VIN decoding
+├── fuel-logs/         # Fuel tracking
+├── maintenance/       # Service records and schedules
+├── notifications/     # Email and toast notifications
+├── onboarding/        # User onboarding flow
+├── platform/          # Vehicle data + VIN decoding
+├── stations/          # Gas station locations
+├── terms-agreement/   # T&C acceptance audit
+├── user-export/       # GDPR data export
+├── user-preferences/  # User settings
+├── user-profile/      # User profile management
+└── vehicles/          # Vehicle management
 ```
 
 ### Feature Structure
@@ -262,13 +271,30 @@ feature-name/
 └── external/          # External service integrations (optional)
 ```
 
-### Current Features
+### Current Features (15)
 
-#### Vehicles
-- **Purpose**: Vehicle inventory management
-- **Tables**: `vehicles` (user-scoped)
-- **Integration**: Platform service for make/model/trim data
-- **Endpoints**: CRUD + dropdown data
+#### Admin
+- **Purpose**: Admin role management and oversight
+- **Tables**: `admin_users`, `admin_audit_logs`
+- **Endpoints**: Admin CRUD, catalog management, station oversight
+
+#### Auth
+- **Purpose**: User authentication and signup
+- **Tables**: None (uses Auth0)
+- **Integration**: Auth0 for identity management
+- **Endpoints**: Signup, verify email, resend verification
+
+#### Backup
+- **Purpose**: Database and document backup/restore
+- **Tables**: `backup_schedules`, `backup_history`, `backup_settings`
+- **Storage**: `/app/data/backups/`
+- **Endpoints**: Admin backup CRUD, restore, schedules
+
+#### Documents
+- **Purpose**: Document storage and retrieval
+- **Tables**: `documents` (user-scoped)
+- **Storage**: Filesystem (`/app/data/documents/`)
+- **Endpoints**: Upload + download + delete
 
 #### Fuel Logs
 - **Purpose**: Fuel purchase and efficiency tracking
@@ -278,21 +304,61 @@ feature-name/
 
 #### Maintenance
 - **Purpose**: Service and maintenance record tracking
-- **Tables**: `maintenance_records` (user-scoped)
-- **Integration**: Vehicles feature for vehicle data
-- **Endpoints**: CRUD + reminders
+- **Tables**: `maintenance_logs`, `maintenance_schedules` (user-scoped)
+- **Integration**: Vehicles feature, notifications
+- **Endpoints**: CRUD + schedules + reminders
+
+#### Notifications
+- **Purpose**: Email and toast notifications
+- **Tables**: `email_templates`, `notification_logs`
+- **Integration**: Resend API for email delivery
+- **Endpoints**: User summary, admin template management
+
+#### Onboarding
+- **Purpose**: User onboarding after signup
+- **Tables**: Uses `user_profiles`, `user_preferences`
+- **Integration**: User profile and preferences features
+- **Endpoints**: Preferences, complete, status
+
+#### Platform
+- **Purpose**: Vehicle data and VIN decoding
+- **Tables**: `engines`, `transmissions`, `vehicle_options`
+- **Integration**: Backend dropdown cascade queries
+- **Endpoints**: Years, makes, models, trims, engines
 
 #### Stations
 - **Purpose**: Gas station location and pricing
-- **Tables**: `stations` (user-scoped)
+- **Tables**: `stations`, `community_stations`
 - **Integration**: Google Maps API
-- **Endpoints**: Search + favorites
+- **Endpoints**: Search + favorites + community reports
 
-#### Documents
-- **Purpose**: Document storage and retrieval
-- **Tables**: `documents` (user-scoped)
-- **Storage**: Filesystem (`/app/data/documents/`)
-- **Endpoints**: Upload + download + delete
+#### Terms Agreement
+- **Purpose**: Legal audit trail for T&C acceptance
+- **Tables**: `terms_agreements`
+- **Integration**: Created during signup flow
+- **Endpoints**: None (internal use)
+
+#### User Export
+- **Purpose**: GDPR-compliant data export
+- **Tables**: None (reads from all user data)
+- **Storage**: Temporary TAR.GZ archives
+- **Endpoints**: Export download
+
+#### User Preferences
+- **Purpose**: User preference management
+- **Tables**: `user_preferences` (user-scoped)
+- **Endpoints**: GET/PUT preferences
+
+#### User Profile
+- **Purpose**: User profile management
+- **Tables**: `user_profiles` (user-scoped)
+- **Endpoints**: GET/PUT profile
+
+#### Vehicles
+- **Purpose**: Vehicle inventory management
+- **Tables**: `vehicles` (user-scoped)
+- **Integration**: Platform service for make/model/trim data
+- **Endpoints**: CRUD + dropdown data + images
 
 ## Data Flow