refactor!: 模块化拆分 src 结构，新增批量同步服务、查询解析器及前端分页/高级检索功能

- src/ 按 clients/services/api 分层，Config 提升至 crate 根
- 新增 batch_sync.rs（双源并行收割）、query_parser.rs（多平台检索式转换）
- build.rs 自动触发前端 npm install & build
- SearchPanel 支持分页/排序/每页条数/高级检索构建器，前端加入搜索缓存
- 新增 SyncPanel 替换 SettingsPanel；新增 live_search 集成测试

Cargo.toml

@@ -3,6 +3,13 @@ name = "astroresearch"
 version = "0.1.0"
 edition = "2021"
 
+[lib]
+path = "src/lib.rs"
+
+[[bin]]
+name = "astroresearch"
+path = "src/main.rs"
+
 [dependencies]
 tokio = { version = "1", features = ["full"] }
 axum = { version = "0.7", features = ["macros"] }