feat(daemon): implement page CRUD routes (Task 8)

- Add routes/pages.ts with pageRoutes handler for POST/GET/DELETE /pages
- Handle POST /pages (create), GET /pages (list), GET /pages/:id, DELETE /pages/:id
- Use safeStringify for all JSON output, proper error codes for 400/404/409/500
- Update server.ts to accept optional BrowserManager and register pageRoutes
- Add 13 unit tests with mock BrowserManager covering all endpoints

packages/daemon/src/server.ts

@@ -1,9 +1,14 @@
 import http from 'node:http';
 import { healthRoute } from './routes/health.js';
+import { pageRoutes } from './routes/pages.js';
+import type { BrowserManager } from './browser-manager.js';
 
-const routes = [healthRoute];
+export function startServer(port: number, browserManager?: BrowserManager): Promise<http.Server> {
+  const routes = [healthRoute];
+  if (browserManager) {
+    routes.push(pageRoutes(browserManager));
+  }
 
-export function startServer(port: number): Promise<http.Server> {
   return new Promise((resolve) => {
     const server = http.createServer((req, res) => {
       for (const route of routes) {