Add structured logging, navigation bar, and code cleanup

## Backend
- Add Pino logging framework with timestamps and structured output
- Replace all console.error statements (49+) with proper logging levels
- Fix Drizzle ORM bug: replace invalid .get() calls with .limit(1)
- Remove unused auth routes file (already in index.js)
- Make internal functions private (remove unnecessary exports)
- Simplify code by removing excessive debug logging

## Frontend
- Add navigation bar to layout with:
  - User's callsign display
  - Navigation links (Dashboard, QSOs, Settings)
  - Logout button with red color distinction
- Navigation only shows when user is logged in
- Dark themed design matching footer

## Documentation
- Update README.md with new project structure
- Update docs/DOCUMENTATION.md with logging and nav bar info
- Add logger.js to configuration section

Co-Authored-By: Claude Sonnet 4.5 <noreply@anthropic.com>

README.md

@@ -24,6 +24,7 @@ A web application for amateur radio operators to track QSOs (contacts) and award
 - **Framework**: Elysia.js
 - **Database**: SQLite with Drizzle ORM
 - **Authentication**: JWT tokens
+- **Logging**: Pino with structured logging and timestamps
 
 ### Frontend
 - **Framework**: SvelteKit
@@ -38,7 +39,8 @@ award/
 │   ├── backend/
 │   │   ├── config/
 │   │   │   ├── database.js     # Database connection
-│   │   │   └── jwt.js          # JWT configuration
+│   │   │   ├── jwt.js          # JWT configuration
+│   │   │   └── logger.js       # Pino logging configuration
 │   │   ├── db/
 │   │   │   └── schema/
 │   │   │       └── index.js    # Database schema (users, qsos, sync_jobs)
@@ -53,9 +55,11 @@ award/
 │       │   │   ├── api.js      # API client
 │       │   │   └── stores.js   # Svelte stores (auth)
 │       │   └── routes/
-│       │       ├── +page.svelte         # Main menu
-│       │       ├── login/+page.svelte   # Login page
-│       │       ├── register/+page.svelte # Registration page
+│       │       ├── +layout.svelte       # Navigation bar & layout
+│       │       ├── +page.svelte         # Dashboard
+│       │       ├── auth/
+│       │       │   ├── login/+page.svelte   # Login page
+│       │       │   └── register/+page.svelte # Registration page
 │       │       ├── qsos/+page.svelte    # QSO log with pagination
 │       │       └── settings/+page.svelte # Settings & LoTW credentials
 │       └── package.json