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

server/routes/config.js

@@ -0,0 +1,78 @@
+/**
+ * Config route handler
+ * Handles configuration get/update and client-side config
+ */
+
+const fs = require('fs');
+const path = require('path');
+
+/**
+ * Handle GET /api/config endpoint
+ * @param {http.IncomingMessage} req - HTTP request object
+ * @param {http.ServerResponse} res - HTTP response object
+ * @param {Object} config - Application configuration
+ */
+function handleGetConfig(req, res, config) {
+  res.writeHead(200, { 'Content-Type': 'application/json' });
+  res.end(JSON.stringify(config));
+}
+
+/**
+ * Handle POST /api/config/update endpoint
+ * @param {http.IncomingMessage} req - HTTP request object
+ * @param {http.ServerResponse} res - HTTP response object
+ * @param {Object} config - Application configuration (will be modified)
+ */
+function handleUpdateConfig(req, res, config) {
+  let body = '';
+  req.on('data', chunk => {
+    body += chunk.toString();
+  });
+  
+  req.on('end', () => {
+    try {
+      const newConfig = JSON.parse(body);
+      if (newConfig.sites) {
+        // Update config object (passed by reference)
+        Object.assign(config, newConfig);
+        
+        // Save to file
+        const configPath = path.join('config', 'sites.json');
+        fs.writeFileSync(configPath, JSON.stringify(config, null, 2));
+        
+        res.writeHead(200, { 'Content-Type': 'application/json' });
+        res.end(JSON.stringify({ success: true, message: 'Configuration updated' }));
+      } else {
+        throw new Error('Invalid configuration format');
+      }
+    } catch (error) {
+      console.error('Error updating configuration:', error);
+      res.writeHead(400, { 'Content-Type': 'application/json' });
+      res.end(JSON.stringify({ error: error.message }));
+    }
+  });
+}
+
+/**
+ * Handle GET /api/config/client endpoint
+ * Returns client-side configuration (API keys, default location)
+ * @param {http.IncomingMessage} req - HTTP request object
+ * @param {http.ServerResponse} res - HTTP response object
+ */
+function handleClientConfig(req, res) {
+  res.writeHead(200, { 'Content-Type': 'application/json' });
+  res.end(JSON.stringify({
+    openweathermapApiKey: process.env.OPENWEATHERMAP_API_KEY || '',
+    defaultLocation: {
+      latitude: parseFloat(process.env.DEFAULT_LATITUDE) || 59.3293,
+      longitude: parseFloat(process.env.DEFAULT_LONGITUDE) || 18.0686,
+      name: process.env.DEFAULT_LOCATION_NAME || 'Stockholm'
+    }
+  }));
+}
+
+module.exports = {
+  handleGetConfig,
+  handleUpdateConfig,
+  handleClientConfig
+};