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([]);
+  }
+}

src/app/page.tsx

@@ -1,11 +1,20 @@
 "use client";
 
-import { useState } from "react";
+import { useState, useRef, useEffect, useCallback } from "react";
 import { useRouter } from "next/navigation";
-import { motion } from "framer-motion";
+import { motion, AnimatePresence } from "framer-motion";
-import { Plus, LogIn, Utensils, Loader2 } from "lucide-react";
+import { Plus, LogIn, Utensils, Loader2, MapPin, Navigation, X } from "lucide-react";
 import { getUserId } from "@/lib/userId";
 
+interface LocationSuggestion {
+  id: string;
+  name: string;
+  district: string;
+  address: string;
+  lat: number;
+  lng: number;
+}
+
 const SHANGHAI_COORDS = { lat: 31.2222, lng: 121.4764 };
 
 function getLocation(): Promise<{ lat: number; lng: number }> {
@@ -35,6 +44,64 @@ export default function LandingPage() {
   const [loadingText, setLoadingText] = useState("");
   const [error, setError] = useState("");
 
+  const [locationQuery, setLocationQuery] = useState("");
+  const [suggestions, setSuggestions] = useState<LocationSuggestion[]>([]);
+  const [showSuggestions, setShowSuggestions] = useState(false);
+  const [selectedLocation, setSelectedLocation] = useState<LocationSuggestion | null>(null);
+  const [fetchingSuggestions, setFetchingSuggestions] = useState(false);
+  const suggestRef = useRef<HTMLDivElement>(null);
+  const debounceRef = useRef<ReturnType<typeof setTimeout>>(null);
+
+  const fetchSuggestions = useCallback(async (query: string) => {
+    if (query.length < 1) {
+      setSuggestions([]);
+      setShowSuggestions(false);
+      return;
+    }
+    setFetchingSuggestions(true);
+    try {
+      const res = await fetch(`/api/location/suggest?keywords=${encodeURIComponent(query)}`);
+      const data: LocationSuggestion[] = await res.json();
+      setSuggestions(data);
+      setShowSuggestions(data.length > 0);
+    } catch {
+      setSuggestions([]);
+    } finally {
+      setFetchingSuggestions(false);
+    }
+  }, []);
+
+  const handleLocationInput = (val: string) => {
+    setLocationQuery(val);
+    setSelectedLocation(null);
+    if (debounceRef.current) clearTimeout(debounceRef.current);
+    debounceRef.current = setTimeout(() => fetchSuggestions(val), 300);
+  };
+
+  const handleSelectLocation = (loc: LocationSuggestion) => {
+    setSelectedLocation(loc);
+    setLocationQuery(loc.name);
+    setShowSuggestions(false);
+    setSuggestions([]);
+  };
+
+  const clearLocation = () => {
+    setSelectedLocation(null);
+    setLocationQuery("");
+    setSuggestions([]);
+    setShowSuggestions(false);
+  };
+
+  useEffect(() => {
+    const handleClickOutside = (e: MouseEvent) => {
+      if (suggestRef.current && !suggestRef.current.contains(e.target as Node)) {
+        setShowSuggestions(false);
+      }
+    };
+    document.addEventListener("mousedown", handleClickOutside);
+    return () => document.removeEventListener("mousedown", handleClickOutside);
+  }, []);
+
   const joinRoom = async (roomId: string) => {
     const userId = getUserId();
     const res = await fetch(`/api/room/${roomId}/join`, {
@@ -49,12 +116,18 @@ export default function LandingPage() {
   const handleCreate = async () => {
     setLoading(true);
     setError("");
-    setLoadingText("正在获取位置...");
 
     try {
-      const coords = await getLocation();
+      let coords: { lat: number; lng: number };
 
-      setLoadingText("正在搜索周边美食...");
+      if (selectedLocation) {
+        coords = { lat: selectedLocation.lat, lng: selectedLocation.lng };
+        setLoadingText("正在搜索周边美食...");
+      } else {
+        setLoadingText("正在获取位置...");
+        coords = await getLocation();
+        setLoadingText("正在搜索周边美食...");
+      }
 
       const res = await fetch("/api/room/create", {
         method: "POST",
@@ -127,6 +200,75 @@ export default function LandingPage() {
         animate={{ y: 0, opacity: 1 }}
         transition={{ duration: 0.5, delay: 0.15 }}
       >
+        <div ref={suggestRef} className="relative">
+          <div className="relative flex items-center">
+            <MapPin size={16} className="absolute left-3 text-zinc-400" />
+            <input
+              type="text"
+              placeholder="搜索位置（默认当前位置）"
+              value={locationQuery}
+              onChange={(e) => handleLocationInput(e.target.value)}
+              onFocus={() => suggestions.length > 0 && setShowSuggestions(true)}
+              disabled={loading}
+              className="h-10 w-full rounded-xl border border-zinc-200 bg-white pl-9 pr-9 text-sm text-zinc-700 outline-none transition-colors placeholder:text-zinc-300 focus:border-emerald-400 focus:ring-2 focus:ring-emerald-100 disabled:opacity-50"
+            />
+            {(selectedLocation || locationQuery) && !loading && (
+              <button
+                onClick={clearLocation}
+                className="absolute right-2.5 flex h-5 w-5 items-center justify-center rounded-full text-zinc-400 hover:text-zinc-600"
+              >
+                <X size={14} />
+              </button>
+            )}
+            {fetchingSuggestions && (
+              <Loader2 size={14} className="absolute right-3 animate-spin text-zinc-300" />
+            )}
+          </div>
+
+          {selectedLocation && (
+            <div className="mt-1.5 flex items-center gap-1.5 px-1">
+              <Navigation size={12} className="shrink-0 text-emerald-500" />
+              <span className="truncate text-xs text-emerald-600">
+                {selectedLocation.district} {selectedLocation.address || selectedLocation.name}
+              </span>
+            </div>
+          )}
+
+          {!selectedLocation && !locationQuery && (
+            <div className="mt-1.5 flex items-center gap-1.5 px-1">
+              <Navigation size={12} className="shrink-0 text-zinc-400" />
+              <span className="text-xs text-zinc-400">将使用当前定位</span>
+            </div>
+          )}
+
+          <AnimatePresence>
+            {showSuggestions && (
+              <motion.ul
+                initial={{ opacity: 0, y: -4 }}
+                animate={{ opacity: 1, y: 0 }}
+                exit={{ opacity: 0, y: -4 }}
+                transition={{ duration: 0.15 }}
+                className="absolute left-0 right-0 top-full z-50 mt-1 max-h-56 overflow-y-auto rounded-xl border border-zinc-100 bg-white py-1 shadow-lg"
+              >
+                {suggestions.map((s) => (
+                  <li key={s.id}>
+                    <button
+                      onClick={() => handleSelectLocation(s)}
+                      className="flex w-full items-start gap-2.5 px-3 py-2.5 text-left transition-colors hover:bg-emerald-50"
+                    >
+                      <MapPin size={14} className="mt-0.5 shrink-0 text-zinc-400" />
+                      <div className="min-w-0">
+                        <p className="truncate text-sm font-medium text-zinc-800">{s.name}</p>
+                        <p className="truncate text-xs text-zinc-400">{s.district} {s.address}</p>
+                      </div>
+                    </button>
+                  </li>
+                ))}
+              </motion.ul>
+            )}
+          </AnimatePresence>
+        </div>
+
         <button
           onClick={handleCreate}
           disabled={loading}