chore(viewer): move dev ports to 5175/5176 (user decision; avoids cms project conflict on 5173)

Co-Authored-By: Claude Code <noreply@anthropic.com>

apps/viewer/playwright.config.ts

@@ -1,20 +1,20 @@
 import { defineConfig, devices } from '@playwright/test';
 
 // 冒烟占位（Task 5）：真实旅程（活动页/瀑布流/大图/admin 联调）随 Task 6-8/11 扩充。
-// webServer 自动拉起 vite dev（5173，/v1 代理 → 127.0.0.1:8080），本地已有实例则复用。
+// webServer 自动拉起 vite dev（5175，/v1 代理 → 127.0.0.1:8080），本地已有实例则复用。
 export default defineConfig({
   testDir: './e2e',
   timeout: 30_000,
   fullyParallel: true,
   reporter: [['list']],
   use: {
-    baseURL: 'http://127.0.0.1:5173',
+    baseURL: 'http://127.0.0.1:5175',
     trace: 'on-first-retry',
   },
   projects: [{ name: 'chromium', use: { ...devices['Desktop Chrome'] } }],
   webServer: {
     command: 'pnpm run dev',
-    url: 'http://127.0.0.1:5173',
+    url: 'http://127.0.0.1:5175',
     reuseExistingServer: true,
     timeout: 60_000,
   },