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>

docs/DOCUMENTATION.md

@@ -24,6 +24,7 @@ The Ham Radio Award Portal is a full-stack web application designed to help amat
 - **ORM**: Drizzle ORM - Type-safe database queries
 - **Authentication**: JWT tokens via `@elysiajs/jwt`
 - **Password Hashing**: bcrypt
+- **Logging**: Pino - Structured logging with timestamps and log levels
 
 **Frontend:**
 - **Framework**: SvelteKit - Modern reactive framework
@@ -118,7 +119,8 @@ Defines the database structure using Drizzle ORM schema builder.
 #### 4. Configuration (`src/backend/config/`)
 
 - **database.js**: Database connection and client initialization
-- **constants.js**: Application constants (JWT expiration, etc.)
+- **jwt.js**: JWT secret configuration
+- **logger.js**: Pino logger configuration with structured logging and timestamps
 
 ### Frontend Components
 
@@ -130,7 +132,14 @@ Defines the database structure using Drizzle ORM schema builder.
 - **`/qsos`**: QSO logbook with filtering and LoTW sync
 - **`/settings`**: LoTW credentials management
 
-#### 2. Libraries
+#### 2. Layout (`+layout.svelte`)
+
+Global layout component providing:
+- **Navigation bar**: Shows user's callsign, navigation links (Dashboard, QSOs, Settings), and logout button
+- Only visible when user is logged in
+- Responsive design with dark theme matching footer
+
+#### 3. Libraries
 
 **API Client** (`src/frontend/src/lib/api.js`)
 - Centralized API communication
@@ -172,13 +181,15 @@ award/
 ├── src/
 │   ├── backend/              # Backend server code
 │   │   ├── config/
-│   │   │   ├── constants.js
-│   │   │   └── database.js
+│   │   │   ├── database.js    # Database connection
+│   │   │   ├── jwt.js         # JWT configuration
+│   │   │   └── logger.js      # Pino logging configuration
 │   │   ├── db/
 │   │   │   └── schema/
 │   │   │       └── index.js   # Drizzle schema definitions
 │   │   ├── services/
 │   │   │   ├── auth.service.js
+│   │   │   ├── job-queue.service.js
 │   │   │   └── lotw.service.js
 │   │   └── index.js           # Main server entry point
 │   │