feat: Single-port deployment with improved error handling and SvelteKit static build

- Frontend now uses @sveltejs/adapter-static for production builds
- Backend serves both API and static files from single port (originally port 3000)
- Removed all throw statements from services to avoid Elysia prototype errors
- Fixed favicon serving and SvelteKit assets path handling
- Added ecosystem.config.js for PM2 process management
- Comprehensive deployment documentation (PM2 + HAProxy)
- Updated README with single-port architecture
- Created start.sh script for easy production start

src/frontend/svelte.config.js

@@ -1,9 +1,15 @@
-import adapter from '@sveltejs/adapter-auto';
+import adapter from '@sveltejs/adapter-static';
 
 /** @type {import('@sveltejs/kit').Config} */
 const config = {
 	kit: {
-		adapter: adapter(),
+		adapter: adapter({
+			pages: 'build',
+			assets: 'build',
+			fallback: 'index.html',
+			precompress: false,
+			strict: true
+		}),
 		// Get app URL from environment or default to localhost
 		// This is used for production builds and CSRF configuration
 		// Set via VITE_APP_URL environment variable