feat: add MCP server with resources, tools, auth, and Traefik routing

- Add backend/app/mcp_server.py with FastMCP server (hms-cms)
- Resources: design-rules, page-structure, sync-status
- Tools: trigger_sync, get_sync_log, set_rentman_token, read_file,
  write_file, create_page, deploy, git_commit, git_status
- Bearer token auth via MCP_AUTH_TOKEN env var
- Mount MCP at /mcp with streamable HTTP transport
- Integrate session manager in FastAPI lifespan
- Add Traefik labels for external /mcp route on hms.media-on.de
- Add git, docker.io, curl to backend Dockerfile
- Mount repo root + docker socket in backend container
- Add mcp>=1.0.0 to requirements.txt

frontend-nuxt-old/pages/index.vue

@@ -0,0 +1,20 @@
+<template>
+  <div>
+    <section class="py-20 sm:py-32" :style="{ background: 'var(--bg)' }">
+      <div class="max-w-7xl mx-auto px-4 sm:px-6 lg:px-8">
+        <div class="max-w-2xl">
+          <h1 class="text-4xl sm:text-5xl font-bold mb-6" style="color: var(--text)">
+            Professionelle Technik<br><span style="color: var(--color-accent)">fuer Ihre Veranstaltung</span>
+          </h1>
+          <p class="text-lg mb-8" style="color: var(--text-muted)">
+            HMS Licht & Ton - Veranstaltungstechnik aus Leipheim / Ellzee.
+          </p>
+          <NuxtLink to="/mietkatalog" class="hms-btn hms-btn-primary text-base px-8 py-4">Mietkatalog oeffnen</NuxtLink>
+        </div>
+      </div>
+    </section>
+  </div>
+</template>
+
+<script setup lang="ts">
+</script>