feat: auto cleanup with retention period, storage limit, settings UI

backend/app/routes/admin.py

@@ -1,12 +1,18 @@
 """Admin management routes."""
+import json
 import os
 from fastapi import APIRouter, HTTPException, Depends, Query
 from sqlalchemy.ext.asyncio import AsyncSession
 from sqlalchemy import select, func, or_
 from app.database import get_db
-from app.models import Video, DownloadLog
-from app.schemas import VideoInfo, VideoListResponse, StorageStats, DownloadLogInfo, DownloadLogListResponse
+from app.models import Video, DownloadLog, AppSetting
+from app.schemas import (
+    VideoInfo, VideoListResponse, StorageStats,
+    DownloadLogInfo, DownloadLogListResponse,
+    CleanupConfig, CleanupStatus, DiskStats,
+)
 from app.auth import get_current_user
+from app.services.cleanup import get_setting, set_setting, disk_stats, run_cleanup
 
 router = APIRouter(prefix="/api/admin", tags=["admin"])
 
@@ -100,3 +106,37 @@ async def download_logs(
         items.append(d)
 
     return DownloadLogListResponse(logs=items, total=total, page=page, page_size=page_size)
+
+
+@router.get("/settings/cleanup", response_model=CleanupStatus)
+async def get_cleanup_settings(user: dict = Depends(get_current_user), db: AsyncSession = Depends(get_db)):
+    video_base = os.getenv("VIDEO_BASE_PATH", "/home/xdl/xdl_videos")
+    last_result_raw = await get_setting(db, "cleanup_last_result", "{}")
+    try:
+        last_result = json.loads(last_result_raw) if last_result_raw else {}
+    except Exception:
+        last_result = {}
+    return CleanupStatus(
+        config=CleanupConfig(
+            enabled=(await get_setting(db, "cleanup_enabled", "true")) == "true",
+            retention_minutes=int(await get_setting(db, "cleanup_retention_minutes", "10080")),
+            storage_limit_pct=int(await get_setting(db, "cleanup_storage_limit_pct", "80")),
+        ),
+        disk=DiskStats(**disk_stats(video_base)),
+        last_run=await get_setting(db, "cleanup_last_run", ""),
+        last_result=last_result,
+    )
+
+
+@router.put("/settings/cleanup", response_model=CleanupStatus)
+async def update_cleanup_settings(cfg: CleanupConfig, user: dict = Depends(get_current_user), db: AsyncSession = Depends(get_db)):
+    await set_setting(db, "cleanup_enabled", "true" if cfg.enabled else "false")
+    await set_setting(db, "cleanup_retention_minutes", str(cfg.retention_minutes))
+    await set_setting(db, "cleanup_storage_limit_pct", str(cfg.storage_limit_pct))
+    return await get_cleanup_settings(user=user, db=db)
+
+
+@router.post("/cleanup/run")
+async def trigger_cleanup(user: dict = Depends(get_current_user)):
+    result = await run_cleanup()
+    return result