fix(ci): fix schema drift, endpoint enum, and MCP test mocks

- schema.prisma: add static_headers and extra_headers to
  LiteLLM_AgentsTable (migration 20260305000000 adds them but root
  schema.prisma was missing them, causing test_aaaasschema_migration_check
  to fail)
- tests/test_utils.py: add /vertex_ai/live to supported_endpoints enum
  so test_aaamodel_prices_and_context_window_json_is_valid passes
- tests/mcp_tests/test_mcp_server.py: explicitly set
  tool_name_to_display_name, tool_name_to_description, byok_api_key_help_url
  to None in both failing MCP mock tests (MagicMock auto-creates these as
  MagicMock objects, causing Pydantic ValidationError in MCPServer)

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

schema.prisma

@@ -70,6 +70,8 @@ model LiteLLM_AgentsTable {
   created_by String
   updated_at    DateTime               @default(now()) @updatedAt @map("updated_at")
   updated_by String
+  static_headers Json?       @default("{}")
+  extra_headers  String[]    @default([])
 }
 
 model LiteLLM_OrganizationTable {

tests/mcp_tests/test_mcp_server.py

@@ -1453,6 +1453,9 @@ async def test_add_update_server_with_alias():
     mock_mcp_server.authorization_url = None
     mock_mcp_server.registration_url = None
     mock_mcp_server.token_url = None
+    mock_mcp_server.tool_name_to_display_name = None
+    mock_mcp_server.tool_name_to_description = None
+    mock_mcp_server.byok_api_key_help_url = None
 
     # Add server to manager
     await test_manager.add_server(mock_mcp_server)
@@ -1535,6 +1538,9 @@ async def test_add_update_server_fallback_to_server_id():
     mock_mcp_server.authorization_url = None
     mock_mcp_server.registration_url = None
     mock_mcp_server.token_url = None
+    mock_mcp_server.tool_name_to_display_name = None
+    mock_mcp_server.tool_name_to_description = None
+    mock_mcp_server.byok_api_key_help_url = None
 
     # Add server to manager
     await test_manager.add_server(mock_mcp_server)

tests/test_litellm/test_utils.py

@@ -754,6 +754,7 @@ def test_aaamodel_prices_and_context_window_json_is_valid():
                             "/v1/audio/transcriptions",
                             "/v1/audio/speech",
                             "/v1/ocr",
+                            "/vertex_ai/live",
                         ],
                     },
                 },