Add client download link and build tarball during deployment

- Added /download/client endpoint to serve the CLI client tarball
- Added "Client" link to navigation in base template
- Created build-client.sh script to clone and package the client
- Updated Dockerfile to run build-client.sh during container build

Co-Authored-By: Claude Opus 4.5 <noreply@anthropic.com>

app/routers/home.py

@@ -5,8 +5,8 @@ Home and root routes for L1 server.
 from pathlib import Path
 
 import markdown
-from fastapi import APIRouter, Request, Depends
-from fastapi.responses import HTMLResponse, RedirectResponse
+from fastapi import APIRouter, Request, Depends, HTTPException
+from fastapi.responses import HTMLResponse, RedirectResponse, FileResponse
 
 from artdag_common import render
 from artdag_common.middleware import wants_html
@@ -77,3 +77,19 @@ async def login_redirect(request: Request):
         "<p>No L2 server configured for authentication.</p></body></html>",
         status_code=503
     )
+
+
+# Client tarball path
+CLIENT_TARBALL = Path(__file__).parent.parent.parent / "artdag-client.tar.gz"
+
+
+@router.get("/download/client")
+async def download_client():
+    """Download the Art DAG CLI client."""
+    if not CLIENT_TARBALL.exists():
+        raise HTTPException(404, "Client package not found. Run build-client.sh to create it.")
+    return FileResponse(
+        CLIENT_TARBALL,
+        media_type="application/gzip",
+        filename="artdag-client.tar.gz"
+    )

app/templates/base.html

@@ -8,6 +8,7 @@
     <a href="/recipes" class="text-gray-300 hover:text-white {% if active_tab == 'recipes' %}text-white font-medium{% endif %}">Recipes</a>
     <a href="/media" class="text-gray-300 hover:text-white {% if active_tab == 'media' %}text-white font-medium{% endif %}">Media</a>
     <a href="/storage" class="text-gray-300 hover:text-white {% if active_tab == 'storage' %}text-white font-medium{% endif %}">Storage</a>
+    <a href="/download/client" class="text-gray-300 hover:text-white" title="Download CLI client">Client</a>
 </nav>
 {% endblock %}