feat: add FastAPI app entrypoint

backend/app/main.py

@@ -0,0 +1,26 @@
+from fastapi import FastAPI
+from fastapi.middleware.cors import CORSMiddleware
+from app.api import auth, configs, zones, interfaces, policies, rules, masq
+
+app = FastAPI(title="Shorefront", version="0.1.0")
+
+app.add_middleware(
+    CORSMiddleware,
+    allow_origins=["http://localhost:5173", "http://localhost:80"],
+    allow_credentials=True,
+    allow_methods=["*"],
+    allow_headers=["*"],
+)
+
+app.include_router(auth.router, prefix="/auth", tags=["auth"])
+app.include_router(configs.router, prefix="/configs", tags=["configs"])
+app.include_router(zones.router, prefix="/configs", tags=["zones"])
+app.include_router(interfaces.router, prefix="/configs", tags=["interfaces"])
+app.include_router(policies.router, prefix="/configs", tags=["policies"])
+app.include_router(rules.router, prefix="/configs", tags=["rules"])
+app.include_router(masq.router, prefix="/configs", tags=["masq"])
+
+
+@app.get("/health")
+def health() -> dict:
+    return {"status": "ok"}