按站点指定下载日期偏移（0=今天…30）+ 修复启动陈旧登录态

偏移量功能（前端/API 可配，服务端持久化、多用户共享）：
- state_store：新增 site_config 表 + get_offset / set_offset(0..30 钳制) / get_all_offsets
- server：新增 GET/PUT /config（百世锁定当天，不可配置）
- 顺心/中通/韵达/安能（各 expected+actual）：日期逻辑由 query_days 范围改为读 offset
  算单日 target=今天-offset，起止同日；百世仍走当日
- config.example.yaml：query_days 标记为已废弃

修复启动时显示上一会话陈旧登录态：
- state_store：新增 reset_login_states（登录态会话级，启动重置为 unknown；数据态会话无关、保留）
- runtime.launch_and_prepare：启动时对各站重置登录态，心跳就绪后重新探测写真实值

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

site_anneng.py

@@ -40,6 +40,7 @@ import yaml
 sys.stdout.reconfigure(encoding="utf-8")
 
 from paths import DOWNLOAD_DIR, CONFIG_PATH
+import state_store
 
 
 def with_retry(site_name, label, flow, reset, max_attempts=3):
@@ -866,12 +867,13 @@ def anneng_expected_download_impl():
     # 清理上次的最终文件，避免本次无数据/失败时残留旧数据误导比对
     _remove_if_exists(os.path.join(download_dir, FINAL_FILENAME))
 
-    query_days = _load_query_days()
+    offset = state_store.get_offset("安能")
     today = datetime.now()
-    start = today - timedelta(days=(query_days - 1))
-    start_str = f"{start.year}-{start.month:02d}-{start.day:02d}"
-    today_str = f"{today.year}-{today.month:02d}-{today.day:02d}"
-    print(f">> 查询时间范围: [{start_str}] 至 [{today_str}]（近 {query_days} 天）")
+    target = today - timedelta(days=offset)
+    target_str = f"{target.year}-{target.month:02d}-{target.day:02d}"
+    start_str = target_str
+    today_str = target_str
+    print(f">> 查询日期: [{target_str}]（偏移 {offset}，0=今天）")
 
     main_cdp = find_main_page_cdp()
     export_times = []
@@ -1171,12 +1173,12 @@ def anneng_actual_download_impl():
     # 清理上次的最终文件，避免本次无数据/失败时残留旧数据误导比对
     _remove_if_exists(os.path.join(download_dir, ACTUAL_FINAL_FILENAME))
 
-    days = _load_query_days()
+    offset = state_store.get_offset("安能")
     today = datetime.now()
-    start = today - timedelta(days=days - 1)
-    start_str = f"{start.year}/{start.month:02d}/{start.day:02d} 00:00:00"
-    end_str = f"{today.year}/{today.month:02d}/{today.day:02d} 23:59:59"
-    print(f">> 扫描时间范围: [{start_str}] 至 [{end_str}]（近 {days} 天）")
+    target = today - timedelta(days=offset)
+    start_str = f"{target.year}/{target.month:02d}/{target.day:02d} 00:00:00"
+    end_str = f"{target.year}/{target.month:02d}/{target.day:02d} 23:59:59"
+    print(f">> 扫描日期: [{start_str} 至 {end_str}]（偏移 {offset}，0=今天）")
 
     main_cdp = find_main_page_cdp()
     try: