feat: 增加公共文件访问功能并添加favicon和robots.txt

- 新增公共文件访问接口，允许从public目录获取文件
- 添加favicon.ico以改善网站标识
- 新增robots.txt以指导搜索引擎爬虫行为

app.py

@@ -1,5 +1,5 @@
 from fastapi import FastAPI, Request, HTTPException
-from fastapi.responses import HTMLResponse
+from fastapi.responses import HTMLResponse, FileResponse
 import markdown
 from fastapi.staticfiles import StaticFiles
 from fastapi.templating import Jinja2Templates
@@ -11,6 +11,14 @@ app = FastAPI()
 templates = Jinja2Templates(directory="templates")
 app.mount("/static", StaticFiles(directory="static"), name="static")
 
+# Mount all files from public directory to root
+@app.get("/{filename}")
+async def get_public_file(filename: str):
+    public_path = os.path.join("public", filename)
+    if os.path.isfile(public_path):
+        return FileResponse(public_path)
+    raise HTTPException(status_code=404, detail="File not found")
+
 # 加载所有问卷数据
 def load_all_scales():
     scales = {}

public/robots.txt

@@ -0,0 +1,4 @@
+User-agent: *
+Allow: /
+
+# Sitemap: /sitemap.xml

templates/base.html

@@ -8,6 +8,7 @@
     <meta name="keywords" content="心尺, PsychoScales, 心理学量表,专业心理测评,抑郁症测试,焦虑症自评,在线心理测评系统,心理咨询师工具, 心理测验, 报告解读, 测试题">
     <meta name="baidu-site-verification" content="codeva-mPOBUr0rLS" />
     <link rel="stylesheet" href="/static/styles.css">
+    <link rel="icon" type="image/x-icon" href="/static/favicon.ico">
     {% block head_extra %}{% endblock %}
 </head>