feat: 交通信息与 AI 解耦，完善出发/回程路线显示

- 从 finalize_plan schema 和 agent 提示词中移除 transit 字段，AI 只负责活动/POI/坐标
- 新增 enrichTransitInfo：计划生成后查询高德 V3 公交 API，计算出发地→首活动、活动间、末活动→出发地三段交通
- parseTransitSegments 增加起终点站显示（去除线路名中的全程终点括号）
- WeekendPlanData 新增 transitFromStart/transitToEnd 字段
- BlindboxPlan 新增出发地和返回出发地交通连接器，传入 startLocationLabel 显示具体地址
- BlindBoxRoom schema 新增 address 字段存完整逆地理地址，city 保留供 API 使用
- 新增 /api/debug/transit 调试端点（仅开发环境）
- agent userPrompt 要求将出发/回程时间计入全天时间预算

src/app/api/blindbox/room/[code]/route.ts

@@ -15,6 +15,7 @@ export const GET = apiHandler(async (_req, { params }) => {
     name: room.name,
     creatorId: room.creatorId,
     city: room.city,
+    address: room.address,
     lat: room.lat,
     lng: room.lng,
     poolCount: room._count.ideas,
@@ -27,7 +28,7 @@ export const GET = apiHandler(async (_req, { params }) => {
 
 export const PATCH = apiHandler(async (req, { params }) => {
   const { code } = await params;
-  const { userId, city, lat, lng } = await req.json();
+  const { userId, city, address, lat, lng } = await req.json();
 
   requireUserId(userId);
 
@@ -51,6 +52,7 @@ export const PATCH = apiHandler(async (req, { params }) => {
     where: { id: room.id },
     data: {
       city: typeof city === "string" ? city.trim() : null,
+      address: typeof address === "string" ? address.trim() : null,
       lat: numLat,
       lng: numLng,
     },
@@ -58,6 +60,7 @@ export const PATCH = apiHandler(async (req, { params }) => {
 
   return NextResponse.json({
     city: updated.city,
+    address: updated.address,
     lat: updated.lat,
     lng: updated.lng,
   });

src/app/api/debug/transit/route.ts

@@ -0,0 +1,90 @@
+/**
+ * Debug endpoint: inspect raw Amap transit API response + parsed result.
+ * GET /api/debug/transit?olat=31.23&olng=121.47&dlat=31.20&dlng=121.50&city=上海
+ * Only available in development.
+ */
+import { NextRequest, NextResponse } from "next/server";
+import { requireAmapApiKey } from "@/lib/amap";
+
+export async function GET(req: NextRequest) {
+  if (process.env.NODE_ENV !== "development") {
+    return NextResponse.json({ error: "only available in development" }, { status: 403 });
+  }
+
+  const { searchParams } = req.nextUrl;
+  const oLat = Number(searchParams.get("olat"));
+  const oLng = Number(searchParams.get("olng"));
+  const dLat = Number(searchParams.get("dlat"));
+  const dLng = Number(searchParams.get("dlng"));
+  const city = searchParams.get("city") ?? "上海";
+
+  if (!oLat || !oLng || !dLat || !dLng) {
+    return NextResponse.json({ error: "需要 olat/olng/dlat/dlng 参数" }, { status: 400 });
+  }
+
+  const apiKey = requireAmapApiKey();
+  const url = new URL("https://restapi.amap.com/v3/direction/transit/integrated");
+  url.searchParams.set("key", apiKey);
+  url.searchParams.set("origin", `${oLng},${oLat}`);
+  url.searchParams.set("destination", `${dLng},${dLat}`);
+  url.searchParams.set("city", city);
+  url.searchParams.set("cityd", city);
+  url.searchParams.set("output", "json");
+
+  const res = await fetch(url.toString());
+  const raw = await res.json();
+
+  if (raw.status !== "1" || !raw.route?.transits?.length) {
+    return NextResponse.json({ error: "未找到路线", raw });
+  }
+
+  const transit = raw.route.transits[0];
+  const durationMin = Math.ceil(Number(transit.duration) / 60);
+  const distanceKm = Math.round(Number(raw.route.distance) / 100) / 10;
+
+  // Parse segments the same way as production code
+  const parts: string[] = [];
+  const segmentDebug: unknown[] = [];
+  for (const seg of (transit.segments ?? []) as Record<string, unknown>[]) {
+    const bus = seg.bus as { buslines?: Record<string, unknown>[] } | undefined;
+    segmentDebug.push({
+      hasWalking: !!seg.walking,
+      hasBus: !!seg.bus,
+      buslines: bus?.buslines?.map((l) => ({
+        name: l.name,
+        type: l.type,
+        via_num: l.via_num,
+        departure: (l.departure_stop as Record<string, unknown> | undefined)?.name,
+        arrival: (l.arrival_stop as Record<string, unknown> | undefined)?.name,
+      })),
+    });
+    if (!bus?.buslines?.length) continue;
+    for (const line of bus.buslines) {
+      const name = String(line.name ?? "");
+      const viaNum = Number(line.via_num ?? 0);
+      parts.push(viaNum > 0 ? `${name}(${viaNum}站)` : name);
+    }
+  }
+
+  return NextResponse.json({
+    parsed: {
+      durationMin,
+      distanceKm,
+      description: parts.join(" → ") || "步行",
+    },
+    segmentDebug,
+    rawTransit: {
+      duration: transit.duration,
+      nightflag: transit.nightflag,
+      segmentCount: transit.segments?.length,
+    },
+    // First 3 routes for comparison
+    allRoutes: raw.route.transits.slice(0, 3).map((t: Record<string, unknown>) => ({
+      durationMin: Math.ceil(Number(t.duration) / 60),
+      segments: (t.segments as Record<string, unknown>[] ?? []).map((s) => {
+        const b = s.bus as { buslines?: Record<string, unknown>[] } | undefined;
+        return b?.buslines?.map((l) => `${l.name}(${l.via_num}站)`) ?? ["步行"];
+      }),
+    })),
+  });
+}

src/app/blindbox/[code]/page.tsx

@@ -43,6 +43,7 @@ interface RoomInfo {
   name: string;
   creatorId: string;
   city: string | null;
+  address: string | null;
   lat: number | null;
   lng: number | null;
   poolCount: number;
@@ -328,15 +329,16 @@ export default function BlindboxRoomPage() {
       const regeoRes = await fetch(`/api/location/regeo?lat=${lat}&lng=${lng}`);
       const regeo = regeoRes.ok ? await regeoRes.json() : {};
       const cityName = regeo.name || "未知位置";
+      const addressLabel = regeo.formatted || cityName;
 
       const patchRes = await fetch(`/api/blindbox/room/${room.code}`, {
         method: "PATCH",
         headers: { "Content-Type": "application/json" },
-        body: JSON.stringify({ userId: profile.id, city: cityName, lat, lng }),
+        body: JSON.stringify({ userId: profile.id, city: cityName, address: addressLabel, lat, lng }),
       });
       if (!patchRes.ok) throw new Error("保存位置失败");
 
-      setRoom((prev) => prev ? { ...prev, city: cityName, lat, lng } : prev);
+      setRoom((prev) => prev ? { ...prev, city: cityName, address: addressLabel, lat, lng } : prev);
       toast.show("位置已设置");
     } catch {
       toast.show("获取位置失败，请允许定位权限");
@@ -1132,6 +1134,7 @@ export default function BlindboxRoomPage() {
                   onDaysChange={handlePlanDaysChange}
                   onRefine={handleRefine}
                   location={room.lng != null && room.lat != null ? `${room.lng},${room.lat}` : undefined}
+                  startLocationLabel={room.address ?? room.city ?? undefined}
                   onAccept={async () => {
                     setPlanAccepted(true);
                     fireConfetti();