支持段落删除与移动排序，修复导出残留与外键约束

- 前端：段落列表/配置区/手动编辑区新增上移、下移、删除按钮，hover 显示
- 前端：移动和删除操作后自动保存到后端，修正 canDeleteBlock 判定逻辑
- 后端：保存段落时级联删除关联的 generation_logs 再删段落
- 后端：导出时清理未被引用的标题段落及其内容，避免已删段落残留在 Word 中
- 后端：删除模板时级联清理 generation_logs/documents/paragraphs

backend/routers/templates.py

@@ -6,11 +6,13 @@ from datetime import datetime
 from io import BytesIO
 
 from fastapi import APIRouter, Depends, File, HTTPException, Query, UploadFile
-from sqlalchemy import func, select
+from sqlalchemy import delete, func, select
 from sqlalchemy.ext.asyncio import AsyncSession
 
 from config import settings
 from database import get_db
+from models.document import Document
+from models.generation_log import GenerationLog
 from models.paragraph import Paragraph
 from models.template import Template
 from schemas.schemas import Response, TemplateSave
@@ -194,8 +196,14 @@ async def save_template_paragraphs(
     paragraph_map = {item.id: item for item in existing_paragraphs}
     incoming_ids = {config.id for config in body.paragraphs if config.id}
 
+    print(f"[SAVE] template_id={template_id}, incoming_ids={incoming_ids}, existing_ids={[p.id for p in existing_paragraphs]}")
+
     for paragraph in existing_paragraphs:
         if paragraph.id not in incoming_ids:
+            print(f"[SAVE] Deleting paragraph id={paragraph.id} title={paragraph.title}")
+            await db.execute(
+                delete(GenerationLog).where(GenerationLog.paragraph_id == paragraph.id)
+            )
             await db.delete(paragraph)
 
     for index, config in enumerate(body.paragraphs, start=1):
@@ -229,7 +237,23 @@ async def delete_template(template_id: int, db: AsyncSession = Depends(get_db)):
         raise HTTPException(status_code=404, detail="模板不存在")
 
     result = await db.execute(select(Paragraph).where(Paragraph.template_id == template_id))
-    for paragraph in result.scalars().all():
+    paragraphs_to_delete = result.scalars().all()
+    paragraph_ids = [p.id for p in paragraphs_to_delete]
+
+    doc_result = await db.execute(select(Document).where(Document.template_id == template_id))
+    documents_to_delete = doc_result.scalars().all()
+
+    if paragraph_ids:
+        await db.execute(
+            delete(GenerationLog).where(GenerationLog.paragraph_id.in_(paragraph_ids))
+        )
+    for document in documents_to_delete:
+        await db.execute(
+            delete(GenerationLog).where(GenerationLog.document_id == document.id)
+        )
+        await db.delete(document)
+
+    for paragraph in paragraphs_to_delete:
         await db.delete(paragraph)
 
     file_path = template.file_path or ""