feat(agent-office): service_proxy pipeline_retry/list_failed_pipelines (+ music-lab status=failed 필터)

Co-Authored-By: Claude Opus 4.8 (1M context) <noreply@anthropic.com>

agent-office/app/service_proxy.py

@@ -352,6 +352,25 @@ async def list_active_pipelines() -> list[dict]:
         return resp.json().get("pipelines", [])
 
 
+async def list_failed_pipelines() -> list[dict]:
+    async with httpx.AsyncClient(timeout=10) as client:
+        resp = await client.get(f"{MUSIC_LAB_URL}/api/music/pipeline?status=failed")
+        resp.raise_for_status()
+        data = resp.json()
+        return data if isinstance(data, list) else data.get("items", data.get("pipelines", []))
+
+
+async def pipeline_retry(pid: int) -> dict:
+    async with httpx.AsyncClient(timeout=15) as client:
+        resp = await client.post(f"{MUSIC_LAB_URL}/api/music/pipeline/{pid}/retry")
+        out = {"status_code": resp.status_code}
+        try:
+            out.update(resp.json())
+        except Exception:
+            pass
+        return out
+
+
 async def get_pipeline(pid: int) -> dict:
     async with httpx.AsyncClient(timeout=15) as client:
         resp = await client.get(f"{MUSIC_LAB_URL}/api/music/pipeline/{pid}")