feat(server): add workbench API, DSH planner worker and RAG pipeline

server/scripts/cleanup_srt.py

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+"""清理未完成的 SRT 导入：重置 kb_3 collection + 更新库状态为空"""
+import sys
+sys.path.insert(0, r'C:\Users\xinmiclaw\Desktop\雅文内容创造工作台\server')
+from sqlmodel import Session, select
+from app.db import engine
+from app.models import KnowledgeBase
+from app.rag import store
+
+# 重置向量 collection（防半成品索引损坏）
+try:
+    store.reset_kb(3)
+    print("kb_3 collection 已重置")
+except Exception as e:
+    print("重置异常:", e)
+
+# 更新库状态
+with Session(engine) as s:
+    kb = s.exec(select(KnowledgeBase).where(KnowledgeBase.name == "直播原文库")).first()
+    if kb:
+        kb.index_status = "empty"
+        kb.file_count = 0
+        kb.chunk_count = 0
+        s.add(kb); s.commit()
+        print("直播原文库状态 → empty（以后想导入随时可导）")
+    else:
+        print("未找到直播原文库记录")