Prepare ERP source for Gitea deployment

app/main.py

@@ -0,0 +1,40 @@
+from fastapi import FastAPI
+from starlette.middleware.sessions import SessionMiddleware
+
+from app.core.settings import get_settings
+from app.core.middleware.context import ContextResolveMiddleware
+from app.core.middleware.domain_resolver import DomainResolverMiddleware
+from app.core.middleware.security_headers import SecurityHeadersMiddleware
+from app.core.startup import on_startup
+from app.core.api import api_router
+from app.ui.app import mount_ui
+
+
+def create_app() -> FastAPI:
+    s = get_settings()
+    app = FastAPI(title=s.APP_NAME, debug=s.DEBUG)
+
+    app.add_middleware(SecurityHeadersMiddleware)
+    app.add_middleware(ContextResolveMiddleware)
+    # Phase 7T.2: added after context so it resolves the request host before
+    # context-aware middleware/routes need tenant/branch/domain state.
+    app.add_middleware(DomainResolverMiddleware)
+    # SessionMiddleware is added last so it is available to downstream
+    # middleware/routes in Starlette's middleware execution order.
+    app.add_middleware(
+        SessionMiddleware,
+        secret_key=s.SECRET_KEY,
+        session_cookie=s.COOKIE_SESSION_NAME,
+        same_site=s.COOKIE_SAMESITE,
+        https_only=s.COOKIE_SECURE,
+    )
+
+    app.add_event_handler("startup", lambda: on_startup(app))
+
+    app.include_router(api_router, prefix="/api")
+    mount_ui(app)
+
+    return app
+
+
+app = create_app()