feat: add FastAPI app factory and health check endpoint

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

app/main.py

@@ -0,0 +1,57 @@
+"""FastAPI application factory for SneakySwole.
+
+Creates and configures the FastAPI app with routes, templates,
+static files, and structured logging.
+"""
+
+from pathlib import Path
+
+import structlog
+from fastapi import FastAPI
+from fastapi.staticfiles import StaticFiles
+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
+
+logger = structlog.get_logger(__name__)
+
+# Template and static file directories
+_BASE_DIR = Path(__file__).resolve().parent
+TEMPLATES_DIR = _BASE_DIR / "templates"
+STATIC_DIR = _BASE_DIR / "static"
+
+
+def create_app() -> FastAPI:
+    """Create and configure the FastAPI application.
+
+    Returns:
+        A fully configured FastAPI application instance.
+    """
+    settings = get_settings()
+    setup_logging(log_level=settings.app_log_level)
+
+    app = FastAPI(
+        title="SneakySwole",
+        description="Open-source workout tracking and programming",
+        version="0.1.0",
+    )
+
+    # Mount static files
+    app.mount("/static", StaticFiles(directory=str(STATIC_DIR)), name="static")
+
+    # Jinja2 templates (available to routes via request.state or dependency)
+    templates = Jinja2Templates(directory=str(TEMPLATES_DIR))
+    app.state.templates = templates
+
+    # Register route modules
+    app.include_router(health_router)
+
+    logger.info("app_started", environment=settings.app_env)
+
+    return app
+
+
+# Uvicorn entry point
+app = create_app()

app/routes/health.py

@@ -0,0 +1,23 @@
+"""Health check route for monitoring and readiness probes.
+
+Provides a simple GET /health endpoint that returns application
+status, name, and version.
+"""
+
+from fastapi import APIRouter
+
+router = APIRouter(tags=["health"])
+
+
+@router.get("/health")
+async def health_check() -> dict:
+    """Return application health status.
+
+    Returns:
+        JSON with app name, version, and status.
+    """
+    return {
+        "app": "sneakyswole",
+        "version": "0.1.0",
+        "status": "ok",
+    }