SSE Patch 增量推送架构全链路实现

- web/sse_manager.py: asyncio.Queue 连接池 + broadcast + event_stream
- web/routers/sse_router.py: GET /api/events + POST /api/internal/collector-patch
- weather_sources.py: 采集后 POST patch 给 web
- Nginx polyweather.conf: /api/events proxy_buffering off
- frontend/api/events/route.ts: Next.js SSE 代理
- frontend/hooks/use-sse-patches.ts: EventSource + useLatestPatch + 重连
- LiveTemperatureThresholdChart: mergePatchIntoHourly 增量合并
- scan-terminal-query: 接入 SSE patch 更新行数据
- 新增 ssePatchArchitecture.test.ts 架构测试

web/routers/sse_router.py

@@ -0,0 +1,39 @@
+"""SSE endpoints for live terminal patch delivery."""
+
+from __future__ import annotations
+
+from typing import Any
+
+from fastapi import APIRouter, HTTPException, Request
+from fastapi.responses import StreamingResponse
+
+from web.sse_manager import sse_manager
+
+
+router = APIRouter(tags=["events"])
+
+
+@router.get("/api/events")
+async def sse_events(request: Request):
+    user_id = getattr(request.state, "auth_user_id", None) or "anon"
+    return StreamingResponse(
+        sse_manager.event_stream(user_id),
+        media_type="text/event-stream",
+        headers={
+            "Cache-Control": "no-cache, no-transform",
+            "Connection": "keep-alive",
+            "X-Accel-Buffering": "no",
+        },
+    )
+
+
+@router.post("/api/internal/collector-patch")
+async def ingest_patch(patch: dict[str, Any]):
+    city = str(patch.get("city") or "").strip().lower()
+    changes = patch.get("changes")
+    if not city:
+        raise HTTPException(status_code=400, detail="city is required")
+    if not isinstance(changes, dict):
+        raise HTTPException(status_code=400, detail="changes must be an object")
+    event = sse_manager.broadcast(city, changes)
+    return {"ok": True, "revision": event["revision"]}