接入客户端登录和配套后端启动

启动客户端时先检查平台登录态，未登录展示登录页，登录后进入启动器首页

独立客户端登录使用平台 auth 接口并对 refresh 做并发去重

Tauri 开发启动改为短命令 agc:serve，并先拉起配套 SpacetimeDB 与 api-server

AGC Vite 代理读取 dev-stack 状态并暴露本地 marker，复用时校验 API target

恢复启动器项目目录输入、最近项目刷新移除和非空文件夹提醒交互

补充启动器和登录 gate 测试，并更新 AI 游戏创作 App 开发文档

scripts/dev.mjs

@@ -134,12 +134,14 @@ const SERVICE_ALIASES = new Map([
   ['api', 'api-server'],
   ['admin', 'admin-web'],
   ['adminWeb', 'admin-web'],
+  ['backend', 'backend'],
   ['all', 'all'],
 ]);
 
 function usage() {
   console.log(`用法:
   npm run dev [-- --watch] [-- --api-port 8090]
+  npm run dev backend [-- --watch]
   npm run dev:spacetime [-- --skip-publish]
   npm run dev:api-server [-- --database genarrative-dev]
   npm run dev:web [-- --api-port 8082]
@@ -345,7 +347,7 @@ function parseArgs(argv, baseEnv) {
 function normalizeServiceName(rawName) {
   const alias = SERVICE_ALIASES.get(rawName);
   const name = alias ?? rawName;
-  if (name === 'all' || SERVICE_NAMES.includes(name)) {
+  if (name === 'all' || name === 'backend' || SERVICE_NAMES.includes(name)) {
     return name;
   }
 
@@ -627,11 +629,16 @@ function ensureSpacetimeToolVersionMatchesWorkspace() {
 function ensureRequiredFiles(command) {
   const requiredFiles = [];
 
-  if (command === 'api-server' || command === 'spacetime' || command === 'all') {
+  if (
+    command === 'api-server' ||
+    command === 'spacetime' ||
+    command === 'all' ||
+    command === 'backend'
+  ) {
     requiredFiles.push([manifestPath, 'server-rs/Cargo.toml']);
   }
 
-  if (command === 'spacetime' || command === 'all') {
+  if (command === 'spacetime' || command === 'all' || command === 'backend') {
     requiredFiles.push([resolve(modulePath, 'Cargo.toml'), 'spacetime-module Cargo.toml']);
   }
 
@@ -1062,12 +1069,13 @@ class DevRunner {
     this.command = command;
     ensureRequiredFiles(command);
     requireCommand('node');
-    if (command === 'api-server' || command === 'all') {
+    if (command === 'api-server' || command === 'all' || command === 'backend') {
       requireCommand('cargo');
     }
     if (
       command === 'spacetime' ||
-      (command === 'all' && (!this.options.skipSpacetime || !this.options.skipPublish))
+      ((command === 'all' || command === 'backend') &&
+        (!this.options.skipSpacetime || !this.options.skipPublish))
     ) {
       requireCommand('spacetime');
     }
@@ -1134,6 +1142,9 @@ class DevRunner {
     if (command === 'all') {
       return !this.options.skipSpacetime || !this.options.skipPublish;
     }
+    if (command === 'backend') {
+      return !this.options.skipSpacetime || !this.options.skipPublish;
+    }
     if (command === 'api-server') {
       return isLoopbackSpacetimeServer(this.state.spacetimeServer);
     }
@@ -1148,6 +1159,7 @@ class DevRunner {
     if (
       this.options.spacetimeServerUrl &&
       command !== 'all' &&
+      command !== 'backend' &&
       command !== 'spacetime'
     ) {
       return;
@@ -1230,7 +1242,7 @@ class DevRunner {
     const portRangeFor = (optionName) =>
       this.explicitOptions.has(optionName) ? null : this.state.portRange;
 
-    if (command === 'all' || command === 'spacetime') {
+    if (command === 'all' || command === 'backend' || command === 'spacetime') {
       if (!options.skipSpacetime && !this.state.spacetimeReused) {
         portConfig.spacetime = {
           host: options.spacetimeHost,
@@ -1240,7 +1252,7 @@ class DevRunner {
       }
     }
 
-    if (command === 'all' || command === 'api-server') {
+    if (command === 'all' || command === 'backend' || command === 'api-server') {
       portConfig.api = {
         host: options.apiHost,
         preferredPort: options.apiPort,
@@ -1298,7 +1310,7 @@ class DevRunner {
 
     this.state.apiTargetHost = resolveClientHost(options.apiHost);
     this.state.adminWebTargetHost = resolveClientHost(options.adminWebHost);
-    if (command === 'all' || command === 'spacetime') {
+    if (command === 'all' || command === 'backend' || command === 'spacetime') {
       this.state.spacetimeServer = `http://${options.spacetimeHost}:${options.spacetimePort}`;
     }
     this.state.apiTarget = `http://${this.state.apiTargetHost}:${options.apiPort}`;
@@ -1392,6 +1404,14 @@ class DevRunner {
       return;
     }
 
+    if (command === 'backend') {
+      await this.startSpacetimeForFullStack();
+      await this.services.get('api-server').start();
+      await this.waitForApiServer();
+      this.startWatchers(['spacetime', 'api-server']);
+      return;
+    }
+
     if (command === 'spacetime') {
       await this.startSpacetimeForFullStack();
     } else {