fix: clean up test fixtures and remove stale .bak test files

- Reset gitea settings after bug tests to prevent cross-test contamination
- Add deleted_at and deleted_by fields to ingress proxy test instance creation
- Call refresh_snapshot after ingress proxy test setup and teardown
- Remove orphaned .bak test files (test_attachments.py.bak, test_demo.py.bak) that were left behind from a previous refactor

tests/api/containers.py

@@ -91,8 +91,11 @@ def test_http_ingress_proxy(app_server):
             "ingress_slug": slug,
             "ingress_port": 8000,
             "ports_json": f'[{{"host": {port}, "container": 8000, "proto": "tcp"}}]',
+            "deleted_at": None,
+            "deleted_by": None,
         }
     )
+    refresh_snapshot()
     try:
         r = requests.get(f"{BASE_URL}/p/{slug}/foo")
         assert r.status_code == 200, r.text
@@ -101,3 +104,4 @@ def test_http_ingress_proxy(app_server):
     finally:
         httpd.shutdown()
         get_table("instances").delete(uid=uid)
+        refresh_snapshot()