Fix proxy configuration for nginx deployment

- Disable WebSocket HMR to prevent SSL WebSocket errors
- Add MIME type headers middleware for /_nuxt/ assets
- Create nginx proxy configuration template
- Add client-side proxy headers plugin
- Update Nuxt configuration for proxy compatibility
- Add comprehensive proxy setup documentation

Resolves WebSocket SSL errors and MIME type issues when running behind nginx proxy.

plugins/proxy-headers.client.ts

@@ -0,0 +1,32 @@
+export default defineNuxtPlugin(() => {
+  // Handle proxy headers and ensure proper request handling
+  if (process.client) {
+    // Disable HMR reconnection attempts since we disabled WebSocket HMR
+    if (window && (window as any).__vite_ping) {
+      (window as any).__vite_ping = () => Promise.resolve()
+    }
+    
+    // Override fetch to handle proxy correctly
+    const originalFetch = window.fetch
+    window.fetch = function(input: RequestInfo | URL, init?: RequestInit) {
+      // Ensure all API calls use relative URLs to work with proxy
+      if (typeof input === 'string' && input.startsWith('/api/')) {
+        // Add proper headers for proxy compatibility
+        return originalFetch(input, {
+          ...init,
+          headers: {
+            'Content-Type': 'application/json',
+            'Accept': 'application/json',
+            ...init?.headers
+          }
+        })
+      }
+      return originalFetch(input, init)
+    }
+    
+    // Handle Nuxt/Vite specific issues with proxy
+    if ('__NUXT__' in window) {
+      console.log('[PROXY] Nuxt app loaded through proxy successfully')
+    }
+  }
+})