feat: add logto auth and backend metrics integration

tests/background-auth-controller.test.ts

@@ -0,0 +1,40 @@
+import { describe, expect, test, vi } from "vitest";
+
+import { createAuthController } from "../src/background/auth/controller";
+
+describe("background-auth-controller", () => {
+  test("returns unauthenticated state when the client is logged out", async () => {
+    const controller = createAuthController({
+      authClient: {
+        getAccessToken: vi.fn(),
+        getIdTokenClaims: vi.fn(),
+        isAuthenticated: vi.fn(async () => false),
+        signIn: vi.fn(),
+        signOut: vi.fn()
+      }
+    });
+
+    await expect(controller.getAuthState()).resolves.toEqual(
+      expect.objectContaining({
+        isAuthenticated: false
+      })
+    );
+  });
+
+  test("delegates sign in to the auth client", async () => {
+    const signIn = vi.fn(async () => undefined);
+    const controller = createAuthController({
+      authClient: {
+        getAccessToken: vi.fn(),
+        getIdTokenClaims: vi.fn(),
+        isAuthenticated: vi.fn(async () => false),
+        signIn,
+        signOut: vi.fn()
+      }
+    });
+
+    await controller.signIn();
+
+    expect(signIn).toHaveBeenCalledTimes(1);
+  });
+});