diff --git a/apps/cli/src/http/index.ts b/apps/cli/src/http/index.ts
index 04b8e58f..7268ba4d 100644
--- a/apps/cli/src/http/index.ts
+++ b/apps/cli/src/http/index.ts
@@ -25,6 +25,7 @@ import { registerWebRoutes } from './routes/web'
 import { registerNlpRoutes } from './routes/nlp'
 import { registerAiRoutes } from './routes/ai'
 import { registerPreferencesRoutes } from './routes/preferences'
+import { registerProxyRoutes } from './routes/proxy'
 import { initServerAiLogger, closeServerAiLogger } from '../ai/logger'
 import { initSync, cleanupSync } from '../sync'
 import { resolveCliPath } from '../paths'
@@ -140,6 +141,10 @@ export async function startHttpServer(options?: HttpServerOptions): Promise<{
 
   if (options?.webRoot && fs.existsSync(options.webRoot)) {
     setWebMode(true)
+    // 注册反向代理：将 /_proxy/chatlab.fun/* 转发至 https://chatlab.fun，
+    // 行为与 vite dev proxy 一致，解决浏览器 CORS 问题（见 vite.web.config.mts:138-144）。
+    // 必须在 @fastify/static 之前注册，确保显式路由优先于静态文件/SPA fallback。
+    registerProxyRoutes(server)
     const fastifyStatic = await import('@fastify/static')
     await server.register(fastifyStatic.default, {
       root: options.webRoot,
diff --git a/apps/cli/src/http/routes/proxy.ts b/apps/cli/src/http/routes/proxy.ts
new file mode 100644
index 00000000..a6eb8de6
--- /dev/null
+++ b/apps/cli/src/http/routes/proxy.ts
@@ -0,0 +1,42 @@
+/**
+ * 反向代理路由 — /_proxy/chatlab.fun/*
+ *
+ * 在 Web 生产模式（chatlab start）下，将 /_proxy/chatlab.fun/* 代理到
+ * https://chatlab.fun，行为与 vite.web.config.mts 中的 dev proxy 保持一致，
+ * 以解决浏览器 CORS 限制。
+ *
+ * 目标 host 硬编码为 https://chatlab.fun，不允许外部指定，避免开放代理风险。
+ */
+
+import type { FastifyInstance } from 'fastify'
+
+const PROXY_TARGET = 'https://chatlab.fun'
+
+export function registerProxyRoutes(server: FastifyInstance): void {
+  server.get<{ Params: { '*': string } }>('/_proxy/chatlab.fun/*', async (request, reply) => {
+    const subPath = request.params['*'] ?? ''
+    const queryString = new URLSearchParams(
+      request.query as Record<string, string>,
+    ).toString()
+    const targetUrl = queryString
+      ? `${PROXY_TARGET}/${subPath}?${queryString}`
+      : `${PROXY_TARGET}/${subPath}`
+
+    try {
+      const upstream = await fetch(targetUrl, {
+        headers: { Accept: request.headers.accept ?? '*/*' },
+        signal: AbortSignal.timeout(10_000),
+      })
+
+      const contentType = upstream.headers.get('content-type') ?? 'application/octet-stream'
+      const body = Buffer.from(await upstream.arrayBuffer())
+
+      reply.code(upstream.status).header('content-type', contentType).send(body)
+    } catch (err) {
+      reply.code(502).send({
+        error: 'Proxy error',
+        message: err instanceof Error ? err.message : String(err),
+      })
+    }
+  })
+}