接入AGC后台模型目录与对话模型选择

新增后台 AGC 模型目录、别名、启停和默认项管理

客户端设置页恢复原状，对话框右下角按别名选择模型

服务端按稳定模型标识映射并校验实际模型白名单

修复 AGC 配套后端端口漂移、启动等待和 SpacetimeDB 版本检查

补充迁移、文档、启动与模型选择测试

scripts/dev.mjs

@@ -649,9 +649,30 @@ function readSpacetimeToolProvenance() {
   if (!version) {
     throw new Error(`无法解析 spacetime 版本输出: ${trimPreview(output)}`);
   }
+  const standalone = spawnSync('spacetimedb-standalone', ['--version'], {
+    cwd: repoRoot,
+    encoding: 'utf8',
+    timeout: 5000,
+    shell: process.platform === 'win32',
+  });
+  // Some installations keep the host inside the version manager rather than PATH.
+  if (!standalone.error && standalone.status === 0) {
+    const standaloneVersion = parseSpacetimeToolVersion(
+      `${standalone.stdout ?? ''}\n${standalone.stderr ?? ''}`,
+    );
+    assertStandaloneVersionMatchesCli(version, standaloneVersion);
+  }
   return { version, commit: parseSpacetimeToolCommit(output) };
 }
 
+function assertStandaloneVersionMatchesCli(cliVersion, standaloneVersion) {
+  if (!standaloneVersion || standaloneVersion !== cliVersion) {
+    throw new Error(
+      `spacetime CLI 为 ${cliVersion}，但 PATH 中的 spacetimedb-standalone 为 ${standaloneVersion || 'unknown'}；请同时更新宿主可执行文件或软链接后重试，不能只更新 CLI。`,
+    );
+  }
+}
+
 function assertSpacetimeToolVersionMatchesWorkspace({
   toolVersion,
   toolCommit = '',
@@ -1438,6 +1459,7 @@ class DevRunner {
 
     if (
       command === 'all' ||
+      command === 'backend' ||
       command === 'api-server' ||
       command === 'bgfilter-worker'
     ) {
@@ -3460,6 +3482,7 @@ export {
   applyLocalFfmpegEnv,
   assertReusableSpacetimeProcessVersionMatchesWorkspace,
   assertSpacetimeToolVersionMatchesWorkspace,
+  assertStandaloneVersionMatchesCli,
   buildApiServerProcessEnv,
   buildBgfilterWorkerProcessEnv,
   buildDevStackSnapshot,