feat: add dev server log panel with real-time streaming

Add the ability to view dev server logs in a dedicated panel with:
- Real-time log streaming via WebSocket events
- ANSI color support using xterm.js
- Scrollback buffer (50KB) for log history on reconnect
- Output throttling to prevent UI flooding
- "View Logs" option in worktree dropdown menu

Server changes:
- Add scrollback buffer and event emission to DevServerService
- Add GET /api/worktree/dev-server-logs endpoint
- Add dev-server:started, dev-server:output, dev-server:stopped events

UI changes:
- Add reusable XtermLogViewer component
- Add DevServerLogsPanel dialog component
- Add useDevServerLogs hook for WebSocket subscription

Closes #462

Co-Authored-By: Claude Opus 4.5 <noreply@anthropic.com>

apps/server/src/routes/worktree/index.ts

@@ -33,6 +33,7 @@ import { createMigrateHandler } from './routes/migrate.js';
 import { createStartDevHandler } from './routes/start-dev.js';
 import { createStopDevHandler } from './routes/stop-dev.js';
 import { createListDevServersHandler } from './routes/list-dev-servers.js';
+import { createGetDevServerLogsHandler } from './routes/dev-server-logs.js';
 import {
   createGetInitScriptHandler,
   createPutInitScriptHandler,
@@ -97,6 +98,11 @@ export function createWorktreeRoutes(events: EventEmitter): Router {
   );
   router.post('/stop-dev', createStopDevHandler());
   router.post('/list-dev-servers', createListDevServersHandler());
+  router.get(
+    '/dev-server-logs',
+    validatePathParams('worktreePath'),
+    createGetDevServerLogsHandler()
+  );
 
   // Init script routes
   router.get('/init-script', createGetInitScriptHandler());