DEV1.0: Initial commit - Workflow Portal with security fixes

- Backend: Express.js + PostgreSQL/SQLite with LDAP/AD integration
- Frontend: React 18 + Vite + TailwindCSS/DaisyUI
- Security fixes applied (2026-07 + 2026-08):
  - LDAP injection prevention, CSRF protection, HttpOnly cookies
  - Session hashing (SHA-256), account lockout, rate limiting
  - Input validation (zod), file upload security, CSP/HSTS headers
  - V3: express-rate-limit updated (ip-address SSRF fix)
  - V4: postcss updated (nanoid DoS fix)
  - V5: Rate-limit on /health endpoint
  - V6: Session rotation on login (session fixation prevention)
  - V9: Task values array limit (DoS prevention)
  - V10: Frontend XSS audit completed
- Docker: Multi-stage build, non-root user, PostgreSQL + backup service

frontend/index.html

@@ -0,0 +1,19 @@
+<!doctype html>
+<html lang="de">
+  <head>
+    <meta charset="UTF-8" />
+    <link rel="icon" type="image/svg+xml" href="/vite.svg" />
+    <meta name="viewport" content="width=device-width, initial-scale=1.0" />
+    <title>Workflow Portal</title>
+    <style>
+      /* FOUC prevention: hide root until CSS is loaded */
+      #root:not(:has(*)) { display: none; }
+      /* Font-display swap to prevent font layout shift */
+      @font-face { font-family: system-ui; src: local('system-ui'); font-display: swap; }
+    </style>
+  </head>
+  <body>
+    <div id="root"></div>
+    <script type="module" src="/src/main.jsx"></script>
+  </body>
+</html>