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/composables/useApi.ts

@@ -0,0 +1,55 @@
+import type { $Fetch } from "nitropack";
+
+/**
+ * Base API client composable.
+ * Uses server-side apiBase for SSR requests, public apiBase for client-side.
+ */
+export function useApi() {
+  const config = useRuntimeConfig();
+  // On server: config.apiBase (http://backend:8000)
+  // On client: config.public.apiBase (/api)
+  const apiBase = import.meta.server ? config.apiBase : config.public.apiBase;
+
+  const client: $Fetch = $fetch.create({
+    baseURL: apiBase,
+    headers: {
+      "Content-Type": "application/json",
+    },
+  });
+
+  async function get<T>(url: string, params?: Record<string, string | number | boolean | undefined>): Promise<T> {
+    return client<T>(url, {
+      method: "GET",
+      params: params as Record<string, string> | undefined,
+    });
+  }
+
+  async function post<T>(url: string, body?: unknown): Promise<T> {
+    return client<T>(url, {
+      method: "POST",
+      body,
+    });
+  }
+
+  async function put<T>(url: string, body?: unknown): Promise<T> {
+    return client<T>(url, {
+      method: "PUT",
+      body,
+    });
+  }
+
+  async function del<T>(url: string): Promise<T> {
+    return client<T>(url, {
+      method: "DELETE",
+    });
+  }
+
+  return {
+    apiBase,
+    client,
+    get,
+    post,
+    put,
+    del,
+  };
+}