add backend source code

backend/app/main.py

@@ -0,0 +1,91 @@
+"""
+FastAPI Main Application
+"""
+import logging
+from fastapi import FastAPI
+from fastapi.middleware.cors import CORSMiddleware
+from fastapi.exceptions import RequestValidationError
+from starlette.exceptions import HTTPException as StarletteHTTPException
+
+from app.core.config import settings
+from app.core.logging_config import logger
+from app.api.v1 import api_router
+
+
+def create_app() -> FastAPI:
+    """Create application instance"""
+    logger.info("Creating FastAPI application instance...")
+    
+    app = FastAPI(
+        title=settings.APP_NAME,
+        version=settings.APP_VERSION,
+        description="""
+## Hospital Performance Management System API
+
+### Function Modules
+- **Basic Data Management**: Department, Staff, Indicators
+- **Performance Assessment**: Assessment records, review workflow
+- **Data Analysis Reports**: Department statistics, trends, rankings
+- **Salary Calculation**: Performance-based payroll
+
+### Tech Stack
+- FastAPI + SQLAlchemy 2.0
+- PostgreSQL
+- Async IO support
+        """,
+        openapi_url=f"{settings.API_PREFIX}/openapi.json",
+        docs_url=f"{settings.API_PREFIX}/docs",
+        redoc_url=f"{settings.API_PREFIX}/redoc",
+    )
+
+    # CORS middleware
+    app.add_middleware(
+        CORSMiddleware,
+        allow_origins=settings.CORS_ORIGINS,
+        allow_credentials=True,
+        allow_methods=["*"],
+        allow_headers=["*"],
+    )
+
+    # Register router
+    app.include_router(api_router, prefix=settings.API_PREFIX)
+
+    # Health check
+    @app.get("/health", tags=["System"])
+    async def health_check():
+        return {"status": "healthy", "version": settings.APP_VERSION}
+
+    # HTTP exception handler
+    @app.exception_handler(StarletteHTTPException)
+    async def http_exception_handler(request, exc):
+        logger.warning(f"HTTP Exception: {request.method} {request.url} - {exc.status_code} - {exc.detail}")
+        raise exc
+
+    # Request validation exception handler
+    @app.exception_handler(RequestValidationError)
+    async def validation_exception_handler(request, exc):
+        logger.error(f"Validation Error: {request.method} {request.url} - {exc}")
+        raise exc
+
+    # Global exception handler
+    @app.exception_handler(Exception)
+    async def global_exception_handler(request, exc):
+        logger.error(f"Global Exception: {request.method} {request.url} - {exc}", exc_info=True)
+        raise exc
+
+    logger.info("FastAPI application instance created successfully")
+    return app
+
+
+app = create_app()
+
+
+if __name__ == "__main__":
+    import uvicorn
+    uvicorn.run(
+        "app.main:app",
+        host="0.0.0.0",
+        port=8000,
+        reload=True,
+        log_level="info"
+    )