feat(dufe): 新增银杏签到码查询服务，并在聚合层注册端点

- source/dufe/ginkgostu_sign_in/ginkgo_sign_in.py: 签到码查询服务
  （Flask + waitress 16 线程，监听 127.0.0.1:9005，端点 GET|POST /dufe/ginkgostu_sign_in）
- systemd/ginkgo_sign_in.service: 常驻服务单元，Restart=always，日志 /var/log/ginkgo_sign_in.log
- source/main.py: 新增 DUFE_BACKEND 与 handle_dufe_sign_in，
  并新增 proxy_forward()（保留请求方法与请求体，支持 POST）；
  原有 proxy()（固定 GET，供 pixiv/bilibili 用）未做任何改动

source/main.py

@@ -3,6 +3,7 @@ from aiohttp import web, ClientSession, ClientTimeout
 
 PIXIV_BACKEND = "http://127.0.0.1:9007"
 BILIBILI_BACKEND = "http://127.0.0.1:9006"
+DUFE_BACKEND = "http://127.0.0.1:9005"
 
 
 async def handle_pixiv(request):
@@ -21,6 +22,14 @@ async def handle_bilibili(request):
     return await proxy(request, target)
 
 
+async def handle_dufe_sign_in(request):
+    # ginkgo_sign_in.service（127.0.0.1:9005），端点 /dufe/ginkgostu_sign_in，支持 GET|POST
+    target = f"{DUFE_BACKEND}/dufe/ginkgostu_sign_in"
+    if request.query_string:
+        target += "?" + request.query_string
+    return await proxy_forward(request, target)
+
+
 async def proxy(request, target):
     timeout = ClientTimeout(total=300)
     async with ClientSession(timeout=timeout) as session:
@@ -42,6 +51,37 @@ async def proxy(request, target):
             )
 
 
+async def proxy_forward(request, target):
+    # 保留请求方法与请求体的转发，供需要 POST 的后端使用（dufe 签到码查询）
+    timeout = ClientTimeout(total=300)
+    data = None
+    fwd_headers = {}
+    if request.method not in ("GET", "HEAD"):
+        data = await request.read()
+        ctype = request.headers.get("Content-Type")
+        if ctype:
+            fwd_headers["Content-Type"] = ctype
+    async with ClientSession(timeout=timeout) as session:
+        try:
+            async with session.request(
+                request.method, target, data=data, headers=fwd_headers
+            ) as resp:
+                body = await resp.read()
+                headers = {}
+                for key in ("Content-Type", "Content-Disposition", "Cache-Control"):
+                    if key in resp.headers:
+                        headers[key] = resp.headers[key]
+                return web.Response(
+                    body=body,
+                    status=resp.status,
+                    headers=headers,
+                )
+        except Exception as e:
+            return web.json_response(
+                {"error": "backend unreachable", "detail": str(e)}, status=502
+            )
+
+
 async def handle_root(request):
     raise web.HTTPFound("https://rrrosmontis.icu/articles/index.html?id=00003")
 
@@ -50,6 +90,8 @@ app = web.Application()
 app.router.add_get("/", handle_root)
 app.router.add_get("/pixiv/get_image", handle_pixiv)
 app.router.add_get("/bilibili/get_video", handle_bilibili)
+app.router.add_get("/dufe/ginkgostu_sign_in", handle_dufe_sign_in)
+app.router.add_post("/dufe/ginkgostu_sign_in", handle_dufe_sign_in)
 
 if __name__ == "__main__":
     web.run_app(app, host="127.0.0.1", port=9008)