feat: migrate to Cloudflare Workers with icon and version upload

Replace Express/SQLite and web/ with frontend/, worker/, and wrangler deploy. Add optional app icon upload, date-based app_version, and build-app workflow input.

Co-authored-by: Cursor <cursoragent@cursor.com>

frontend/src/api/client.ts

@@ -0,0 +1,104 @@
+const API_BASE = import.meta.env.VITE_API_BASE ?? "";
+
+export type BuildStatus =
+  | "pending"
+  | "queued"
+  | "in_progress"
+  | "completed"
+  | "failed";
+
+export interface Build {
+  id: string;
+  appName: string;
+  appNameEn: string;
+  appIdentifier: string;
+  appVersion: string;
+  status: BuildStatus;
+  workflowRunId: number | null;
+  windowsUrl: string | null;
+  androidUrl: string | null;
+  error: string | null;
+  createdAt: string;
+  updatedAt: string;
+  actionsUrl?: string | null;
+}
+
+interface ApiErrorResponse {
+  error?: string;
+}
+
+interface CreateBuildResponse {
+  id: string;
+  error?: string;
+}
+
+function apiUrl(path: string): string {
+  return `${API_BASE}${path}`;
+}
+
+export async function createBuild(formData: FormData): Promise<{ id: string }> {
+  let response: Response;
+  try {
+    response = await fetch(apiUrl("/api/builds"), {
+      method: "POST",
+      body: formData,
+    });
+  } catch {
+    throw new Error(
+      "无法连接后端，请确认已运行 npm run dev 且 wrangler 已启动",
+    );
+  }
+
+  const data = (await readJson(response)) as CreateBuildResponse;
+  if (!response.ok) {
+    throw new Error(data.error ?? "上传失败");
+  }
+  return data;
+}
+
+export async function fetchBuild(id: string): Promise<Build> {
+  const response = await fetch(apiUrl(`/api/builds/${id}`));
+  const data = (await readJson(response)) as Build;
+  if (!response.ok) {
+    const errorData = data as Build & ApiErrorResponse;
+    throw new Error(errorData.error ?? "Failed to load build");
+  }
+  return data;
+}
+
+export async function fetchBuilds(): Promise<Build[]> {
+  const response = await fetch(apiUrl("/api/builds"));
+  const data = (await readJson(response)) as { builds: Build[] };
+  if (!response.ok) {
+    throw new Error("Failed to load builds");
+  }
+  return data.builds;
+}
+
+async function readJson(response: Response): Promise<unknown> {
+  const text = await response.text();
+  if (!text) return {};
+
+  try {
+    return JSON.parse(text) as unknown;
+  } catch {
+    throw new Error(`Unexpected response from server: ${text.slice(0, 200)}`);
+  }
+}
+
+export function statusLabel(status: BuildStatus): string {
+  switch (status) {
+    case "pending":
+      return "准备中";
+    case "queued":
+      return "排队中";
+    case "in_progress":
+      return "构建中";
+    case "completed":
+      return "已完成";
+    case "failed":
+      return "失败";
+    default:
+      return status;
+  }
+}