feat: add base template with Pico CSS dark theme and home page

Co-Authored-By: Claude Opus 4.6 <noreply@anthropic.com>

app/main.py

@@ -14,6 +14,7 @@ from fastapi.templating import Jinja2Templates
 from app.config import get_settings
 from app.logging_config import setup_logging
 from app.routes.health import router as health_router
+from app.routes.pages import router as pages_router
 
 logger = structlog.get_logger(__name__)
 
@@ -47,6 +48,7 @@ def create_app() -> FastAPI:
 
     # Register route modules
     app.include_router(health_router)
+    app.include_router(pages_router)
 
     logger.info("app_started", environment=settings.app_env)