feat: 新增 /v1/checkin-status 与 /v1/checkin（每日签到透传）

src/codebuddy_proxy/__main__.py

@@ -815,6 +815,61 @@ async def health():
     }
 
 
+# ============================================================================
+# 端点：/v1/checkin-status 与 /v1/checkin（每日签到透传）
+# ============================================================================
+
+async def _billing_post(path: str) -> dict[str, Any]:
+    """用本地已登录会话调用官方 billing 端点并返回原始 JSON。
+
+    自动处理 401：先走 ensure_authenticated 刷新 token 再重试一次。
+    """
+    state = get_state()
+    url = state.client.endpoint.rstrip("/") + path
+    async with httpx.AsyncClient(timeout=httpx.Timeout(10.0)) as client:
+        resp = await client.post(url, json={}, headers=state.client.auth_headers())
+        if resp.status_code == 401:
+            # token 过期：触发一次刷新后重试
+            try:
+                await asyncio.to_thread(state.client.ensure_authenticated, False)
+            except Exception:
+                pass
+            resp = await client.post(url, json={}, headers=state.client.auth_headers())
+        try:
+            return resp.json()
+        except Exception:
+            return {"code": resp.status_code, "msg": f"non-JSON response (HTTP {resp.status_code})"}
+
+
+@app.get("/v1/checkin-status")
+async def checkin_status():
+    """查询每日签到活动状态（透传官方 /v2/billing/meter/checkin-status）。"""
+    state = get_state()
+    try:
+        state.ensure_auth()
+    except Exception as e:
+        raise HTTPException(status_code=503, detail={"error": {"message": f"not authenticated: {e}", "type": "auth_error"}})
+    result = await _billing_post("/v2/billing/meter/checkin-status")
+    return {"status": "ok", "upstream": result}
+
+
+@app.post("/v1/checkin")
+async def checkin():
+    """执行每日签到（透传官方 /v2/billing/meter/daily-checkin）。
+
+    业务结果原样返回：code=0 且 data 非空为领取成功；已签到/活动结束等
+    业务拒绝通过上游 data.status / msg 区分，这里不做二次解释。
+    """
+    state = get_state()
+    try:
+        state.ensure_auth()
+    except Exception as e:
+        raise HTTPException(status_code=503, detail={"error": {"message": f"not authenticated: {e}", "type": "auth_error"}})
+    result = await _billing_post("/v2/billing/meter/daily-checkin")
+    diagnostic("checkin_claim_result", code=result.get("code"), msg=result.get("msg"))
+    return {"status": "ok", "upstream": result}
+
+
 # ============================================================================
 # 端点：/v1/models
 # ============================================================================