feat: 双模式集成并精简 API 文档/Token、设置页卡片自适应

- 源/仓库各自可在直连(FTP/SFTP、MySQL)与 Metrix 存储/数据库平台间独立选择，两侧互不依赖
- Metrix 模式下源走平台储存 API、仓库走平台导入 + run-script(single_session)、查看导出代理到平台
- 去掉对外 API 文档与 API Token（前后端 + auth/config 解耦），业务接口仅登录态可访问
- 授权默认到期日改为 2026-12-30
- 设置页卡片改横向自适应（宽屏并排、窄屏换行），处理历史保留卡片收窄

app/services/auto_scheduler.py

@@ -11,6 +11,7 @@ from fastapi import HTTPException
 
 from app import state
 from app.config import CACHE_DIR, AutoSchedulerConfig
+from app.services.platform import make_source_downloader
 from app.services.remote_download import RemoteDataDownloader, RemoteFileInfo
 from app.utils.file_dates import parse_file_date_range, required_week_days
 
@@ -186,7 +187,7 @@ class AutoScheduler:
             return self._trigger_processing(target_dates, ready_flag, manual)
 
         target_days = required_week_days(scheduler.week_offset)
-        downloader = RemoteDataDownloader(remote_config)
+        downloader = make_source_downloader(app_config)
         rj_config = app_config.rj_data.normalized()
         rj_directories = set(rj_config.weekly_directories) if rj_config.enabled else set()