feat: add nginx conf for legacy backend and frontend

assets/legacy.nginx.conf

@@ -0,0 +1,98 @@
+
+# Setup this path to coconut-legacy frontend.
+set $frontend_root /var/www/coconut-leaf/frontend-legacy;
+root $frontend_root;
+index home.html;
+
+# ============================
+# Route 1: /web -> HTML templates with extensionless fallback
+# ============================
+location /web {
+	# Use alias to exactly mapping
+	alias $frontend_root/templates;
+
+	# Optimize for static file
+	expires 7d;
+	add_header Cache-Control "public, max-age=604800";
+	gzip_static on;
+
+	# Try file with .html suffix
+	try_files $uri.html $uri =404;
+}
+
+# /web/eventAdd -> templates/event.html, replace {{uuidPath}} with blank
+location = /web/eventAdd {
+	alias $frontend_root/templates/event.html;
+	default_type text/html;
+	sub_filter '{{uuidPath}}' '';
+	sub_filter_once on;
+}
+
+# /web/eventUpdate/<path:uuidPath> -> templates/event.html, replace {{uuidPath}} with uuidPath
+location ~ ^/web/eventUpdate/(?<uuidPath>.+)$ {
+	alias $frontend_root/templates/event.html;
+	default_type text/html;
+	sub_filter '{{uuidPath}}' $uuidPath;
+	sub_filter_once on;
+}
+
+# ============================
+# Route 2: /static -> static files
+# ============================
+location /static {
+	# Use alias to exactly mapping
+	alias $frontend_root/static;
+
+	# Optimize for static file
+	expires 7d;
+	add_header Cache-Control "public, max-age=604800";
+	gzip_static on;
+
+	# Try file with .html suffix
+	try_files $uri $uri =404;
+}
+
+# ============================
+# Route 3: /api -> reverse proxy to backend
+# ============================
+location /api {
+	# Rewrite to remove "api" prefix
+	rewrite ^/api(/.*)$ $1 break;
+
+	# Reverse proxy to localhost backend
+	proxy_pass http://127.0.0.1:8848;
+
+	# Keep original request headers
+	proxy_set_header Host $host;
+	proxy_set_header X-Real-IP $remote_addr;
+	proxy_set_header X-Forwarded-For $proxy_add_x_forwarded_for;
+	proxy_set_header X-Forwarded-Proto $scheme;
+
+	# Optional: WebSocket support
+	# proxy_http_version 1.1;
+	# proxy_set_header Upgrade $http_upgrade;
+	# proxy_set_header Connection "upgrade";
+	
+	# Time configuration
+	proxy_connect_timeout 60s;
+	proxy_send_timeout 60s;
+	proxy_read_timeout 60s;
+
+	# Buffer setup (changed when meeting large file uploading)
+	proxy_buffering on;
+	proxy_buffer_size 4k;
+	proxy_buffers 8 4k;
+}
+
+# ============================
+# Root path redirect: Root -> /web/home
+# ============================
+location = / {
+	return 302 /web/home;
+}
+
+# Deny hidden files at root level
+location ~ /\. {
+	deny all;
+	return 404;
+}