feat: enhance security by implementing HttpOnly refresh tokens and in-memory access token management

- Added isomorphic-dompurify for improved XSS protection
- Refactored token storage to use in-memory management for access tokens
- Implemented server-side route handlers for OAuth token management
- Introduced security headers in next.config.js
- Removed client-side exposure of client_secret and sensitive tokens
- Updated API interceptors to handle token refresh logic
- Cleaned up cookie management for refresh tokens

next.config.js

@@ -40,6 +40,34 @@ const nextConfig = {
   poweredByHeader: false,
   // Enable standalone output for Docker
   output: 'standalone',
+  async headers() {
+    const csp = [
+      "default-src 'self'",
+      "img-src 'self' https: data: blob:",
+      "script-src 'self' 'unsafe-inline' 'unsafe-eval'",
+      "style-src 'self' 'unsafe-inline'",
+      "font-src 'self' data:",
+      "connect-src 'self' https://api.clinic-pro.ir https://back-dev.clinic-pro.ir",
+      "frame-ancestors 'none'",
+      "object-src 'none'",
+      "base-uri 'self'",
+      "form-action 'self'",
+    ].join('; ');
+
+    return [
+      {
+        source: '/(.*)',
+        headers: [
+          { key: 'Strict-Transport-Security', value: 'max-age=63072000; includeSubDomains; preload' },
+          { key: 'X-Frame-Options', value: 'DENY' },
+          { key: 'X-Content-Type-Options', value: 'nosniff' },
+          { key: 'Referrer-Policy', value: 'strict-origin-when-cross-origin' },
+          { key: 'Permissions-Policy', value: 'camera=(), microphone=(), geolocation=()' },
+          { key: 'Content-Security-Policy', value: csp },
+        ],
+      },
+    ];
+  },
 };
 
 module.exports = nextConfig;