移除示例项目初始化并修复前后端稳定性问题

backend/app/core/deps.py

@@ -1,7 +1,7 @@
 from typing import Annotated, AsyncGenerator, Callable, Iterable
 import uuid
 
-from fastapi import Depends, HTTPException, status
+from fastapi import Depends, HTTPException, Request, status
 from pydantic import ValidationError
 from sqlalchemy.ext.asyncio import AsyncSession
 
@@ -139,11 +139,71 @@ async def get_cra_site_scope(
 def require_study_not_locked():
     """检查项目是否被锁定，如果锁定则拒绝所有修改请求"""
     from app.crud import study as study_crud
+    from app.crud import faq_category as faq_category_crud
+    from app.crud import faq_item as faq_item_crud
+
+    async def resolve_study_id(request: Request, db: AsyncSession) -> uuid.UUID:
+        raw_study_id = request.path_params.get("study_id") or request.query_params.get("study_id")
+        if raw_study_id:
+            try:
+                return uuid.UUID(str(raw_study_id))
+            except ValueError as exc:
+                raise HTTPException(
+                    status_code=status.HTTP_422_UNPROCESSABLE_ENTITY,
+                    detail="项目 ID 格式错误",
+                ) from exc
+
+        try:
+            body = await request.json()
+        except Exception:
+            body = None
+        if isinstance(body, dict) and body.get("study_id"):
+            try:
+                return uuid.UUID(str(body["study_id"]))
+            except ValueError as exc:
+                raise HTTPException(
+                    status_code=status.HTTP_422_UNPROCESSABLE_ENTITY,
+                    detail="项目 ID 格式错误",
+                ) from exc
+
+        raw_category_id = request.path_params.get("category_id")
+        if raw_category_id:
+            try:
+                category_id = uuid.UUID(str(raw_category_id))
+            except ValueError as exc:
+                raise HTTPException(
+                    status_code=status.HTTP_422_UNPROCESSABLE_ENTITY,
+                    detail="分类 ID 格式错误",
+                ) from exc
+            category = await faq_category_crud.get_category(db, category_id)
+            if not category or not category.study_id:
+                raise HTTPException(status_code=status.HTTP_404_NOT_FOUND, detail="分类不存在")
+            return category.study_id
+
+        raw_item_id = request.path_params.get("item_id")
+        if raw_item_id:
+            try:
+                item_id = uuid.UUID(str(raw_item_id))
+            except ValueError as exc:
+                raise HTTPException(
+                    status_code=status.HTTP_422_UNPROCESSABLE_ENTITY,
+                    detail="FAQ ID 格式错误",
+                ) from exc
+            item = await faq_item_crud.get_item(db, item_id)
+            if not item or not item.study_id:
+                raise HTTPException(status_code=status.HTTP_404_NOT_FOUND, detail="FAQ 不存在")
+            return item.study_id
+
+        raise HTTPException(
+            status_code=status.HTTP_422_UNPROCESSABLE_ENTITY,
+            detail="缺少项目 ID",
+        )
     
     async def dependency(
-        study_id: uuid.UUID,
+        request: Request,
         db: AsyncSession = Depends(get_db_session),
     ):
+        study_id = await resolve_study_id(request, db)
         study = await study_crud.get(db, study_id)
         if not study:
             raise HTTPException(