feat: 手动上传绕防爬、下载错误诊断与健康检查工具；模块化重构 API 与批量同步

后端：
  - 将 handlers.rs (1338行) 拆分为 helpers/papers/notes/sync 四模块
  - 将 batch_sync.rs 拆分为 batch/{mod,meta,asset} 三模块
  - 新增 POST /api/upload 多部件文件上传接口
  - 新增 POST /api/no_resource 标记文献"无全文资源"
  - 新增 GET/POST /api/active_bibcode 追踪活跃文献
  - StandardPaper 结构体扩展 pdf_error / html_error 错误诊断字段
  - download.rs 记录下载失败详情至数据库
  - 新增 health_check 二进制工具，支持只读扫描与 --fix 自动修复
  - 移除 scratch/ 目录、recovered_handlers.rs 及调试日志

  前端：
  - 新建 CustomSelect 可复用组件，替换全部原生 select
  - LibraryPanel：同步按钮反馈动画、下载失败/无资源状态筛选与计数、
    文献类型筛选、状态优先排序、搜索一键清空
  - 详情弹窗：错误诊断展示、手动 PDF/HTML 上传区、无资源标记/恢复
  - SearchPanel：扩展文献类型徽章、下载失败状态提示
  - SyncPanel：同步启动乐观 UI 更新、日志容器内自动滚动
  - Tab 状态 localStorage 持久化、弹窗 z-index 修复

Cargo.toml

@@ -2,6 +2,7 @@
 name = "astroresearch"
 version = "0.1.0"
 edition = "2021"
+default-run = "astroresearch"
 
 [lib]
 path = "src/lib.rs"
@@ -11,12 +12,14 @@ name = "astroresearch"
 path = "src/main.rs"
 
 [[bin]]
-name = "test_qiniu"
-path = "scratch/test_qiniu.rs"
+name = "health_check"
+path = "src/bin/health_check.rs"
+
+
 
 [dependencies]
 tokio = { version = "1", features = ["full"] }
-axum = { version = "0.7", features = ["macros"] }
+axum = { version = "0.7", features = ["macros", "multipart"] }
 tower-http = { version = "0.5", features = ["cors", "fs", "trace"] }
 sqlx = { version = "0.7", features = ["runtime-tokio-rustls", "sqlite", "chrono", "json"] }
 serde = { version = "1.0", features = ["derive"] }