fix(viewer+backend): cache sorties TTL 10min + /sorties/local + viewer non-bloquant

pipeline_runner/runner.py

@@ -122,7 +122,7 @@ async def run_pipeline(sortie_id: str, queue: asyncio.Queue) -> None:
 
 
 async def scan_sorties() -> list[dict]:
-    """List available sorties on GDrive via rclone lsd."""
+    """List available sorties on GDrive via rclone lsd (lent ~30s)."""
     result = subprocess.run(
         ["rclone", "lsd", GDRIVE_REMOTE],
         capture_output=True, text=True
@@ -135,3 +135,15 @@ async def scan_sorties() -> list[dict]:
             processed = (OUTPUT_DIR / name / "processed" / "usv.json.gz").exists()
             sorties.append({"id": name, "processed": processed})
     return sorties
+
+
+def scan_sorties_local() -> list[dict]:
+    """List sorties already synced locally in OUTPUT_DIR (instantané, pas rclone)."""
+    if not OUTPUT_DIR.exists():
+        return []
+    sorties = []
+    for d in sorted(OUTPUT_DIR.iterdir()):
+        if d.is_dir():
+            processed = (d / "processed" / "usv.json.gz").exists()
+            sorties.append({"id": d.name, "processed": processed})
+    return sorties