Fix login authentication flow and improve proxy configuration

- Refactor login page to use auth composable for better state management
- Update nginx proxy settings with proper timeouts and buffering
- Improve PWA service worker caching strategy for API calls
- Add debug files and documentation for login troubleshooting

server/api/auth/direct-login.post.ts

@@ -234,10 +234,10 @@ export default defineEventHandler(async (event) => {
 
     // Create session with appropriate expiration
     const sessionManager = createSessionManager();
-    const cookieDomain = process.env.COOKIE_DOMAIN || undefined;
     const maxAge = !!rememberMe ? 60 * 60 * 24 * 30 : 60 * 60 * 24 * 7; // 30 days vs 7 days
     
-    console.log(`🍪 Setting session cookie (Remember Me: ${!!rememberMe}) with domain:`, cookieDomain);
+    // Don't set a domain for the cookie - let it default to the current domain
+    console.log(`🍪 Setting session cookie (Remember Me: ${!!rememberMe}) without explicit domain`);
     
     // Create the session cookie string using the session manager
     const sessionCookieString = sessionManager.createSession(sessionData, !!rememberMe);
@@ -250,7 +250,6 @@ export default defineEventHandler(async (event) => {
       httpOnly: true,
       secure: process.env.NODE_ENV === 'production',
       sameSite: 'lax',
-      domain: cookieDomain,
       maxAge,
       path: '/',
     });