feat: Phase 2 — web server, REST API, WebSocket/SSE, UI [v0.2.0]

AsyncEventBridge bridges sync EventEmitter to asyncio consumers.
FastAPI app with session management, discussion control, roles/providers.
WebSocket for real-time events + inject, SSE for read-only streaming.
Minimal dark-theme HTML/JS UI. `meeting-room serve` CLI subcommand.

Co-Authored-By: Claude Opus 4.7 <noreply@anthropic.com>

pyproject.toml

@@ -16,7 +16,7 @@ dependencies = [
 ]
 
 [project.optional-dependencies]
-dev = ["pytest>=7.0", "pytest-mock>=3.0"]
+dev = ["pytest>=7.0", "pytest-mock>=3.0", "pytest-asyncio>=0.23"]
 web = ["fastapi>=0.100", "uvicorn>=0.20", "websockets>=11.0"]