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app/lib/city-slugs.ts

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+import { cities, type City } from "@/app/data/cities";
+
+const CITY_SLUG_BY_NAME: Record<string, string> = {
+  大理: "dali",
+  成都: "chengdu",
+  深圳: "shenzhen",
+  上海: "shanghai",
+  杭州: "hangzhou",
+  厦门: "xiamen",
+  北京: "beijing",
+  广州: "guangzhou",
+  重庆: "chongqing",
+  昆明: "kunming",
+  三亚: "sanya",
+  丽江: "lijiang",
+  西安: "xian",
+  南京: "nanjing",
+  长沙: "changsha",
+  青岛: "qingdao",
+  苏州: "suzhou",
+  珠海: "zhuhai",
+};
+
+function normalizeSlug(value: string): string {
+  return value
+    .trim()
+    .toLowerCase()
+    .replace(/['’]/g, "")
+    .replace(/[^a-z0-9]+/g, "-")
+    .replace(/^-+|-+$/g, "");
+}
+
+export function citySlug(city: Pick<City, "slug" | "name" | "nameEn" | "id">): string {
+  if (city.slug) return normalizeSlug(city.slug);
+  if (CITY_SLUG_BY_NAME[city.name]) return CITY_SLUG_BY_NAME[city.name];
+  if (city.nameEn) return normalizeSlug(city.nameEn);
+  return `city-${city.id}`;
+}
+
+export function cityVolunteerHref(city: Pick<City, "slug" | "name" | "nameEn" | "id">): string {
+  return `/city/${encodeURIComponent(citySlug(city))}/volunteer`;
+}
+
+export function findCityBySlug(slug: string): City | undefined {
+  const decoded = decodeURIComponent(slug).trim();
+  const normalized = normalizeSlug(decoded);
+  return cities.find((city) => {
+    const candidates = [
+      city.slug,
+      citySlug(city),
+      city.name,
+      city.nameEn,
+      CITY_SLUG_BY_NAME[city.name],
+    ].filter(Boolean);
+    return candidates.some((candidate) => {
+      const text = String(candidate);
+      return text === decoded || normalizeSlug(text) === normalized;
+    });
+  });
+}