feat(scheduler): add snapshot-seed CLI and 10m seed deferral

Add `python app.py snapshot-seed [--date]` (offline clone, Debian /
docker compose exec friendly). When seed fires while full-site snapshot
is running, or last_completed is missing (no_source), record skip as
non-success and retry in 10 minutes until a real seed succeeds; fans
and quiet-window rules unchanged.

reaction_board/cli.py

@@ -4,6 +4,7 @@
     python app.py init        # 建库 / 迁移 / 写入黑名单种子（离线）
     python app.py ingest      # 手动入库 B 站视频链接 / BV 号 / av 号（只写本地库）
     python app.py snapshot    # 采集当日七项快照与粉丝数
+    python app.py snapshot-seed  # 用上一完成日克隆当日壳（离线，可 --date）
     python app.py discover    # 执行一次搜索发现并写入候选池
     python app.py candidates  # 查看候选池（离线）
     python app.py auth-check  # 检查 Cookie 登录态
@@ -42,6 +43,7 @@ from .services.up_profile import UpProfileService
 from .timeutil import (
     in_snapshot_quiet_window,
     interval_next_run,
+    is_date,
     next_after_snapshot_quiet_window,
     next_daily_run,
     parse_hhmm,
@@ -78,6 +80,17 @@ def _build_parser() -> argparse.ArgumentParser:
     snapshot.add_argument(
         "--force", action="store_true", help="忽略当日完成标记，重新采集"
     )
+    snapshot_seed = sub.add_parser(
+        "snapshot-seed",
+        parents=[common],
+        help="用上一完成日克隆当日快照壳（离线，不调 B 站）",
+    )
+    snapshot_seed.add_argument(
+        "--date",
+        default=None,
+        metavar="YYYY-MM-DD",
+        help="目标统计日（默认上海时区今天）",
+    )
     discover = sub.add_parser(
         "discover", parents=[common], help="执行一次搜索发现并写入候选池"
     )
@@ -170,6 +183,14 @@ def _clear_task_running(repo: Repository, name: str) -> None:
         pass
 
 
+def _is_task_running(repo: Repository, name: str) -> bool:
+    """供 seed 等任务检测全站快照是否在跑（避让，而非互斥跳过成功）。"""
+    try:
+        return bool(repo.kv_get(_task_running_key(name)))
+    except Exception:  # noqa: BLE001
+        return False
+
+
 def _record_task(
     repo: Repository,
     name: str,
@@ -206,7 +227,11 @@ def _record_task(
 
 # 全站快照 / 粉丝失败后的补跑间隔（秒）
 _TASK_RETRY_SECONDS = 300.0
+# snapshot_seed：全站快照占用 / 尚无 last_completed 时的补跑间隔（秒）
+_SEED_RETRY_SECONDS = 600.0
 _QUIET_SKIP_REASON = "snapshot_quiet_window"
+_SEED_SKIP_SNAPSHOT_RUNNING = "snapshot_running"
+_SEED_SKIP_NO_SOURCE = "no_source"
 
 
 def _quiet_window_defer(
@@ -240,6 +265,38 @@ def _retry_soon(now: float | None = None) -> float:
     return (time.time() if now is None else now) + _TASK_RETRY_SECONDS
 
 
+def _seed_retry_soon(now: float | None = None) -> float:
+    return (time.time() if now is None else now) + _SEED_RETRY_SECONDS
+
+
+def _defer_snapshot_seed(
+    repo: Repository,
+    logger: JsonLogger,
+    *,
+    started_at: int,
+    reason: str,
+    finished_at: int | None = None,
+) -> TaskControl:
+    """seed 因 snapshot 占用 / no_source 延后：记 skip（非成功），10 分钟后再试。"""
+    finished = int(finished_at if finished_at is not None else time.time())
+    logger.info("snapshot_seed.skip", reason=reason)
+    _record_task(
+        repo,
+        "snapshot_seed",
+        ok=False,
+        skipped=True,
+        started_at=started_at,
+        finished_at=finished,
+        payload={"skipped": True, "reason": reason},
+        error=reason,
+    )
+    return TaskControl(
+        ok=False,
+        next_run=_seed_retry_soon(float(finished)),
+        error=reason,
+    )
+
+
 def _client(credentials, logger: JsonLogger, *, pacer=None, retries: int = 3) -> BilibiliClient:
     return BilibiliClient(
         cookie=credentials.cookie,
@@ -397,6 +454,82 @@ def cmd_snapshot(args, logger: JsonLogger) -> int:
         db.close()
 
 
+def cmd_snapshot_seed(args, logger: JsonLogger) -> int:
+    """离线克隆：``python app.py snapshot-seed [--date YYYY-MM-DD]``。
+
+    与调度器同一套规则：全站 ``snapshot`` 运行中或 ``no_source`` 时不记成功，
+    返回码非 0，便于 ``docker compose exec re-xxm python app.py snapshot-seed`` 排查。
+    """
+    store = ConfigStore(args.config, require_auth=False)
+    cfg = store.get()
+    db = _open_db(cfg, logger)
+    try:
+        repo = Repository(db)
+        target = args.date
+        if target is not None and not is_date(target):
+            raise ConfigError(f"日期格式必须是 YYYY-MM-DD: {target!r}")
+        started = int(time.time())
+        if _is_task_running(repo, "snapshot"):
+            payload = {
+                "ok": False,
+                "skipped": True,
+                "reason": _SEED_SKIP_SNAPSHOT_RUNNING,
+                "stat_date": target or shanghai_date(),
+                "database": str(cfg.storage.database_path),
+            }
+            _record_task(
+                repo,
+                "snapshot_seed",
+                ok=False,
+                skipped=True,
+                started_at=started,
+                finished_at=int(time.time()),
+                payload=payload,
+                error=_SEED_SKIP_SNAPSHOT_RUNNING,
+            )
+            _print(payload)
+            return 1
+        # seed 只读本地库，不调 B 站；占位 client 满足构造约束。
+        service = SnapshotService(store, repo, object(), logger=logger)
+        _mark_task_running(repo, "snapshot_seed", started_at=started)
+        try:
+            summary = service.run_seed_from_last_completed(date=target)
+        except Exception as exc:  # noqa: BLE001
+            _record_task(
+                repo, "snapshot_seed", ok=False, started_at=started,
+                finished_at=int(time.time()), error=str(exc),
+            )
+            raise
+        payload = summary.as_dict()
+        payload["database"] = str(cfg.storage.database_path)
+        finished = int(summary.finished_at or time.time())
+        if summary.reason == _SEED_SKIP_NO_SOURCE:
+            _record_task(
+                repo,
+                "snapshot_seed",
+                ok=False,
+                skipped=True,
+                started_at=int(summary.started_at or started),
+                finished_at=finished,
+                payload={**payload, "skipped": True, "reason": _SEED_SKIP_NO_SOURCE},
+                error=_SEED_SKIP_NO_SOURCE,
+            )
+            _print(payload)
+            return 1
+        _record_task(
+            repo,
+            "snapshot_seed",
+            ok=True,
+            started_at=int(summary.started_at or started),
+            finished_at=finished,
+            payload=payload,
+        )
+        _print(payload)
+        return 0
+    finally:
+        db.close()
+
+
 def _telegram(cfg, logger: JsonLogger):
     if not cfg.telegram.enabled:
         return None
@@ -733,6 +866,14 @@ def cmd_run(args, logger: JsonLogger, *, serve_web: bool = False) -> int:
 
         def run_snapshot_seed():
             started = int(time.time())
+            # 全站快照占用时不执行、不记成功；10 分钟后重试直到真正 seed 成功。
+            if _is_task_running(repo, "snapshot"):
+                return _defer_snapshot_seed(
+                    repo,
+                    logger,
+                    started_at=started,
+                    reason=_SEED_SKIP_SNAPSHOT_RUNNING,
+                )
             _mark_task_running(repo, "snapshot_seed", started_at=started)
             try:
                 summary = snapshot_service.run_seed_from_last_completed()
@@ -743,17 +884,28 @@ def cmd_run(args, logger: JsonLogger, *, serve_web: bool = False) -> int:
                     finished_at=finished, error=str(exc),
                 )
                 return TaskControl(
-                    ok=False, next_run=_retry_soon(float(finished)), error=str(exc),
+                    ok=False,
+                    next_run=_seed_retry_soon(float(finished)),
+                    error=str(exc),
                 )
             payload = summary.as_dict()
             finished = int(summary.finished_at or time.time())
+            last["snapshot_seed"] = summary
+            logger.info("snapshot.seed_summary", **payload)
+            if summary.reason == _SEED_SKIP_NO_SOURCE:
+                return _defer_snapshot_seed(
+                    repo,
+                    logger,
+                    started_at=int(summary.started_at or started),
+                    reason=_SEED_SKIP_NO_SOURCE,
+                    finished_at=finished,
+                )
+            # already_completed / already_seeded / seeded → 成功，推到次日 seed_at
             _record_task(
                 repo, "snapshot_seed", ok=True, started_at=summary.started_at,
                 finished_at=finished,
                 payload=payload,
             )
-            last["snapshot_seed"] = summary
-            logger.info("snapshot.seed_summary", **payload)
             return TaskControl(
                 ok=True, next_run=next_daily_run(float(finished), seed_at),
             )
@@ -942,6 +1094,8 @@ def main(argv: Sequence[str] | None = None) -> int:
             return cmd_init(args, logger)
         if args.command == "snapshot":
             return cmd_snapshot(args, logger)
+        if args.command == "snapshot-seed":
+            return cmd_snapshot_seed(args, logger)
         if args.command == "ingest":
             return cmd_ingest(args, logger)
         if args.command == "backfill-followers":