Live deploy console: stream compose up output to the browser (0.22.0)

Deploying a local stack from the editor now opens a console modal that streams
the `docker compose up -d` output (image pulls, container creation) live over a
new `/ws/deploy/{stack_id}` WebSocket, replacing the blind "Deploying…" spinner.
The compose subprocess keeps running server-side if the modal is closed early;
the same audit entry + start/error notification as the REST start path is recorded.

Co-Authored-By: Claude Opus 4.8 <noreply@anthropic.com>

backend/services/compose_service.py

@@ -329,6 +329,25 @@ async def stream_compose(
     await proc.wait()
 
 
+async def stream_up(stack_id: str, override: Optional[str] = None):
+    """Run `compose up -d` streaming combined output, so the deploy console can
+    show image-pull and container-create progress live.
+
+    Yields ``("log", line)`` for each output line, then ``("done", returncode)``.
+    """
+    cmd = _compose_base_cmd(stack_id, override) + ["up", "-d", "--remove-orphans"]
+    proc = await asyncio.create_subprocess_exec(
+        *cmd,
+        stdout=asyncio.subprocess.PIPE,
+        stderr=asyncio.subprocess.STDOUT,
+    )
+    assert proc.stdout is not None
+    async for raw in proc.stdout:
+        yield ("log", raw.decode("utf-8", "replace").rstrip("\n"))
+    await proc.wait()
+    yield ("done", proc.returncode)
+
+
 # Convenience lifecycle wrappers ------------------------------------------------