feat: 添加数据库支持以保存问卷响应

- 新增数据库模型和连接配置，使用SQLite存储问卷响应
- 更新结果处理逻辑，将用户响应保存到数据库
- 更新.gitignore以排除数据库文件和缓存目录

.gitignore

@@ -1 +1,3 @@
 scales/
+psychoscales.db
+__pycache__/

app.py

@@ -1,4 +1,4 @@
-from fastapi import FastAPI, Request, HTTPException
+from fastapi import FastAPI, Request, HTTPException, Depends
 from fastapi.responses import HTMLResponse, FileResponse, Response
 import markdown
 from fastapi.staticfiles import StaticFiles
@@ -8,6 +8,8 @@ import os
 import uvicorn
 from datetime import datetime
 from xml.etree import ElementTree as ET
+from sqlalchemy.orm import Session
+from database import get_db, RawResponse
 
 app = FastAPI()
 templates = Jinja2Templates(directory="templates")
@@ -76,12 +78,19 @@ async def scale(request: Request, scale_id: str):
     raise HTTPException(status_code=404, detail="问卷未找到")
 
 @app.post("/scales/{scale_id}", response_class=HTMLResponse)
-async def result(request: Request, scale_id: str):
+async def result(request: Request, scale_id: str, db: Session = Depends(get_db)):
     form_data = await request.form()
     tags, scales = load_all_scales()
     scale = scales.get(scale_id)
     if scale:
-        # 这里可以添加保存数据到数据库等逻辑
+        # Save response to database
+        db_response = RawResponse(
+            scale_id=scale_id,
+            user_agent=request.headers.get("user-agent", "Unknown"),
+            response=dict(form_data)
+        )
+        db.add(db_response)
+        db.commit()
         responses = {}
         average = {}
         options = {}

database.py

@@ -0,0 +1,33 @@
+from sqlalchemy import create_engine, Column, Integer, String, Float, DateTime, ForeignKey, JSON
+from sqlalchemy.ext.declarative import declarative_base
+from sqlalchemy.orm import sessionmaker, relationship
+from datetime import datetime, UTC
+
+SQLALCHEMY_DATABASE_URL = "sqlite:///./psychoscales.db"
+
+engine = create_engine(
+    SQLALCHEMY_DATABASE_URL, connect_args={"check_same_thread": False}
+)
+SessionLocal = sessionmaker(autocommit=False, autoflush=False, bind=engine)
+
+Base = declarative_base()
+
+class RawResponse(Base):
+    __tablename__ = "responses_raw"
+
+    id = Column(Integer, primary_key=True, index=True)
+    scale_id = Column(String, index=True)
+    user_agent = Column(String)
+    response = Column(JSON)
+    created_at = Column(DateTime, default=datetime.now(UTC))
+
+# Create tables
+Base.metadata.create_all(bind=engine)
+
+# Dependency
+def get_db():
+    db = SessionLocal()
+    try:
+        yield db
+    finally:
+        db.close()