feat: add local auth billing and usage management

tests/bailian-client.test.ts

@@ -63,6 +63,7 @@ describe("Bailian client", () => {
       { type: "last_frame", url: "https://app.example.com/last.png" }
     ]);
     expect(payload.parameters).toMatchObject({ duration: 10, resolution: "1080P", prompt_extend: true, watermark: false });
+    expect(payload.parameters).not.toHaveProperty("size");
   });
 
   it("normalizes task state and result URLs", () => {