refactor(backend): better code quality, fix timeout issue, fix website eat port 3000, fix nginx wrong point, better docker compose file, moving some file and change some import, update package dependency etc.

nginx.conf

@@ -30,24 +30,32 @@ http {
     limit_req_zone $binary_remote_addr zone=ratelimit:10m rate=5r/s;
 
     server {
-        listen 8606;
+        listen 80;
+        server_name localhost;
+
+        # Use Docker's internal DNS resolver with a short TTL
+        # This prevents caching stale IPs when containers are rebuilt
+        resolver 127.0.0.11 valid=10s;
+        set $upstream http://erika:3000;
 
         # Bypass rate limit for static assets and Next.js internal files
         location /_next/static/ {
-            proxy_pass http://127.0.0.1:3000;
+            proxy_pass $upstream;
             proxy_http_version 1.1;
             proxy_set_header Host $host;
 
             # Cache static assets for 1 year (they have hashed filenames)
             add_header Cache-Control "public, max-age=31536000, immutable";
+            allow all;
         }
 
         location /_next/ {
-            proxy_pass http://127.0.0.1:3000;
+            proxy_pass $upstream;
             proxy_http_version 1.1;
             proxy_set_header Upgrade $http_upgrade;
             proxy_set_header Connection "upgrade";
             proxy_set_header Host $host;
+            allow all;
         }
 
         # Apply rate limit to actual page loads and API requests
@@ -56,7 +64,7 @@ http {
             limit_req zone=ratelimit burst=30 nodelay;
             
             # Proxy to the Next.js app
-            proxy_pass http://127.0.0.1:3000;
+            proxy_pass $upstream;
             
             # Next.js often requires HTTP/1.1
             proxy_http_version 1.1;