feat: server log streaming via SSE for desktop log panel

- LogStreamService: singleton that extends ConsoleLogger, captures all
  NestJS log output into an RxJS Subject while preserving stdout
- main.ts: uses LogStreamService.instance as app logger
- supervisor.controller.ts: new @Sse('logs/stream') endpoint pipes
  log entries (timestamp, level, context, message) to connected clients

Co-Authored-By: Claude Opus 4.6 (1M context) <noreply@anthropic.com>

src/main.ts

@@ -3,9 +3,11 @@ import type { NestExpressApplication } from '@nestjs/platform-express';
 import { join } from 'path';
 import { AppModule } from './app.module';
 import { ConfigService } from '@nestjs/config';
+import { LogStreamService } from './logging/log-stream.service';
 
 async function bootstrap() {
-    const app = await NestFactory.create<NestExpressApplication>(AppModule);
+    const logger = LogStreamService.instance;
+    const app = await NestFactory.create<NestExpressApplication>(AppModule, { logger });
     const config = app.get(ConfigService);
 
     app.enableCors({