fix(plugins): expose model auth API to context-engine plugins (#41090)

Merged via squash.

Prepared head SHA: ee96e96bb9
Co-authored-by: xinhuagu <562450+xinhuagu@users.noreply.github.com>
Co-authored-by: jalehman <550978+jalehman@users.noreply.github.com>
Reviewed-by: @jalehman

extensions/test-utils/plugin-runtime-mock.ts

@@ -253,6 +253,11 @@ export function createPluginRuntimeMock(overrides: DeepPartial<PluginRuntime> =
     state: {
       resolveStateDir: vi.fn(() => "/tmp/openclaw"),
     },
+    modelAuth: {
+      getApiKeyForModel: vi.fn() as unknown as PluginRuntime["modelAuth"]["getApiKeyForModel"],
+      resolveApiKeyForProvider:
+        vi.fn() as unknown as PluginRuntime["modelAuth"]["resolveApiKeyForProvider"],
+    },
     subagent: {
       run: vi.fn(),
       waitForRun: vi.fn(),