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

NOTICE

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+TaskPool (任务池)
+Copyright 2025 engigu
+
+This product includes software developed by engigu.
+
+=========================================================================
+ATTRIBUTION NOTICE
+=========================================================================
+
+According to the Apache License, Version 2.0 (the "License"), any 
+redistribution of this Work or Derivative Works thereof must retain 
+this NOTICE file and the attribution contained within.
+
+YOU MUST NOT REMOVE THE ORIGINAL AUTHOR'S NAME ("engigu"), COPYRIGHT 
+NOTICES, OR THE PROJECT NAME ("TaskPool" / "任务池") FROM ANY 
+PART OF THE SOURCE CODE, UI, OR DOCUMENTATION.
+
+Any derivative work or modified version must include a prominent and 
+verifiable attribution to the original author.
+
+=========================================================================