feat: 支持创建房间时指定位置搜索餐厅

新增位置搜索框，通过高德输入提示 API 提供地点联想，
用户可选择指定位置或使用默认当前定位来查询周边餐厅。

src/app/api/location/suggest/route.ts

@@ -0,0 +1,52 @@
+import { NextResponse } from "next/server";
+
+export async function GET(req: Request) {
+  const { searchParams } = new URL(req.url);
+  const keywords = searchParams.get("keywords")?.trim();
+
+  if (!keywords) {
+    return NextResponse.json([]);
+  }
+
+  const apiKey = process.env.AMAP_API_KEY;
+  if (!apiKey) {
+    return NextResponse.json(
+      { error: "AMAP_API_KEY not configured" },
+      { status: 500 },
+    );
+  }
+
+  try {
+    const url = new URL("https://restapi.amap.com/v3/assistant/inputtips");
+    url.searchParams.set("key", apiKey);
+    url.searchParams.set("keywords", keywords);
+    url.searchParams.set("datatype", "poi");
+
+    const res = await fetch(url.toString());
+    const data = await res.json();
+
+    if (data.status !== "1" || !data.tips) {
+      return NextResponse.json([]);
+    }
+
+    const suggestions = data.tips
+      .filter((t: { location?: string }) => t.location && t.location !== "")
+      .slice(0, 8)
+      .map((t: { id: string; name: string; district?: string; address?: string; location: string }) => {
+        const [lng, lat] = t.location.split(",").map(Number);
+        return {
+          id: t.id,
+          name: t.name,
+          district: t.district || "",
+          address: t.address || "",
+          lat,
+          lng,
+        };
+      });
+
+    return NextResponse.json(suggestions);
+  } catch (e) {
+    console.error("Location suggest error:", e);
+    return NextResponse.json([]);
+  }
+}