fix(sync): 「全部历史」真的拉全部历史，自动同步不再每次静默失败

四个独立的 bug 叠在一起，表现为「只同步两天、没有进度」：

* 前端 `...(days ? { days } : {})` 把 days=0 当成未传。「全部历史」
  存的就是 0，请求体里根本没有 days，后端退回 7 天默认值。
* scheduler 用 `s[0]` 读 query_one 返回的 dict，抛 KeyError 后被
  per-account 的 except 吞掉。只要用户存过一次设置，每 30 分钟的
  自动同步就一次都没成功过——库里那 2 天全是手动点出来的。
* 增量同步查 `health_daily`（表其实叫 health_data），后台线程直接
  死掉，状态永远卡在 syncing，进度条不动。
* UI 完全不看 /sync 的返回值，rate_limited 时按钮点了没反应；轮询
  结束时又把 rate_limited 归进 else 分支报「同步完成」。

顺带：
* 日循环遇到 429 立即退避并保留已拉到的天数，而不是当成「跳过一天」
  继续往下捶 700 天——这正是之前限流死循环的来源之一。
* 定时循环显式传 SYNC_DAYS。历史范围按 UI 文案只描述手动全量同步，
  让半小时一次的 tick 重拉 730 天必然把限流撞得更深。
* 短同步逐天上报进度（原来每 5 天一次，7 天的同步全程停在 0）。
* /sync 路由重复解析 body，空 body 会 None.get 崩。
* 4 个 StubGarth 缺 configure()，7 个测试在此之前一直是红的。

新增 deploy/push.sh：NAS 只认密码，脚本开一个 ssh 复用连接，密码只
输一次，后面推送 / 重启 / 健康检查全走它。不碰 .env、.venv 和数据库。

Co-Authored-By: Claude Opus 5 <noreply@anthropic.com>

backend/tests/test_scheduler.py

@@ -184,3 +184,58 @@ class TestEndpoints:
         r = client.get("/api/garmin/auto-sync", headers=auth)
         assert r.status_code == 200
         assert "intervalSeconds" in r.get_json()
+
+
+class TestSyncWindowResolution:
+    """Which window each account is synced over.
+
+    `query_one` returns a dict, so reading the saved 历史范围 as `s[0]` raised
+    KeyError — swallowed by the per-account handler, which meant every
+    scheduled tick failed for every account that had ever opened 设置, and
+    nothing was synced automatically at all.
+    """
+
+    def _account(self, user, monkeypatch):
+        from services import garmin as garmin_svc
+
+        garmin_svc.save_token(user["id"], "t1")
+        seen = {}
+
+        def record(uid, creds, days=None, client=None):
+            seen["days"] = days
+            return {"status": "success", "recordsSynced": 0}
+
+        monkeypatch.setattr(garmin_svc, "sync_data", record)
+        return seen
+
+    def test_saved_history_days_is_honoured(self, db, user, monkeypatch):
+        from services import settings as settings_svc
+
+        seen = self._account(user, monkeypatch)
+        settings_svc.save_settings(user["id"], {"historyDays": 90})
+
+        results = scheduler.sync_all_accounts()
+        assert [r["status"] for r in results] == ["success"]
+        assert seen["days"] == 90
+
+    def test_full_history_becomes_the_maximum(self, db, user, monkeypatch):
+        from services import settings as settings_svc
+
+        seen = self._account(user, monkeypatch)
+        settings_svc.save_settings(user["id"], {"historyDays": 0})
+
+        scheduler.sync_all_accounts()
+        assert seen["days"] == 730
+
+    def test_the_scheduled_tick_ignores_the_history_setting(
+        self, db, user, monkeypatch
+    ):
+        """历史范围 is the window for the manual 全量同步. A half-hourly tick
+        re-pulling 全部历史 is what kept the account in a 429 loop."""
+        from services import settings as settings_svc
+
+        seen = self._account(user, monkeypatch)
+        settings_svc.save_settings(user["id"], {"historyDays": 0, "autoSync": True})
+
+        scheduler.sync_all_accounts(days=scheduler.SYNC_DAYS, respect_schedule=True)
+        assert seen["days"] == scheduler.SYNC_DAYS