Refactor: Complete codebase reorganization and modernization

- Split server.js routes into modular files (server/routes/)
  - departures.js: Departure data endpoints
  - sites.js: Site search and nearby sites
  - config.js: Configuration endpoints

- Reorganized file structure following Node.js best practices:
  - Moved sites-config.json to config/sites.json
  - Moved API_RESPONSE_DOCUMENTATION.md to docs/
  - Moved raspberry-pi-setup.sh to scripts/
  - Archived legacy files to archive/ directory

- Updated all code references to new file locations
- Added archive/ to .gitignore to exclude legacy files from repo
- Updated README.md with new structure and organization
- All functionality tested and working correctly

Version: 1.2.0

public/js/utils/constants.js

@@ -0,0 +1,89 @@
+/**
+ * Application constants and configuration values
+ * Centralizes magic numbers, API endpoints, and default settings
+ */
+
+const Constants = {
+    // Server configuration
+    PORT: 3002,
+    API_BASE_URL: 'http://localhost:3002',
+    
+    // API Endpoints
+    ENDPOINTS: {
+        DEPARTURES: '/api/departures',
+        SITES_SEARCH: '/api/sites/search',
+        SITES_NEARBY: '/api/sites/nearby',
+        CONFIG_UPDATE: '/api/config/update'
+    },
+    
+    // External API URLs
+    EXTERNAL_APIS: {
+        SL_TRANSPORT_BASE: 'https://transport.integration.sl.se/v1',
+        OPENWEATHERMAP_BASE: 'https://api.openweathermap.org/data/2.5'
+    },
+    
+    // Refresh intervals (in milliseconds)
+    REFRESH: {
+        DEPARTURES: 5000, // 5 seconds
+        WEATHER: 30 * 60 * 1000, // 30 minutes
+        DARK_MODE_CHECK: 60000 // 1 minute
+    },
+    
+    // Default location (Stockholm, Sweden)
+    DEFAULT_LOCATION: {
+        LATITUDE: 59.3293,
+        LONGITUDE: 18.0686,
+        NAME: 'Stockholm'
+    },
+    
+    // Default site configuration
+    DEFAULT_SITE: {
+        ID: '1411',
+        NAME: 'Ambassaderna'
+    },
+    
+    // Default search radius (in meters)
+    DEFAULT_SEARCH_RADIUS: 5000, // 5km
+    
+    // Transport mode identifiers
+    TRANSPORT_MODES: {
+        BUS: 'bus',
+        METRO: 'metro',
+        TRAIN: 'train',
+        TRAM: 'tram',
+        SHIP: 'ship'
+    },
+    
+    // CSS class names (for consistency)
+    CSS_CLASSES: {
+        DARK_MODE: 'dark-mode',
+        ORIENTATION_NORMAL: 'normal',
+        ORIENTATION_LANDSCAPE: 'landscape',
+        ORIENTATION_VERTICAL: 'vertical',
+        ORIENTATION_UPSIDE_DOWN: 'upsidedown',
+        ORIENTATION_VERTICAL_REVERSE: 'vertical-reverse'
+    },
+    
+    // Time thresholds (in minutes)
+    TIME_THRESHOLDS: {
+        URGENT: 5, // Less than 5 minutes is urgent (red)
+        WITHIN_HOUR: 60 // Within next hour
+    },
+    
+    // LocalStorage keys
+    STORAGE_KEYS: {
+        CONFIG: 'sl-departures-config'
+    },
+    
+    // Timezone
+    TIMEZONE: 'Europe/Stockholm',
+    
+    // Date/time formats
+    DATE_FORMAT: {
+        TIMEZONE: 'Europe/Stockholm',
+        LOCALE: 'sv-SE'
+    }
+};
+
+// Export constants
+window.Constants = Constants;