Initial commit: TaskPool React panel

- React frontend with route-level code splitting
- Backend rebranded from Baihu to TaskPool
- DB brand migration script and local compatibility

internal/constant/version.go

@@ -0,0 +1,12 @@
+package constant
+
+import "time"
+
+// 构建时注入的变量
+var (
+	Version   = "dev"
+	BuildTime = "unknown"
+)
+
+// 程序启动时间
+var StartTime = time.Now()