feat: adapt image tuning by engine

tests/task-management.test.ts

@@ -21,6 +21,9 @@ const envNames = [
   "SUPABASE_SERVICE_ROLE_KEY",
   "ZHINIAN_API_KEYS",
   "JIMENG_VISUAL_MOCK",
+  "IMAGE_GENERATE_ENGINE",
+  "EVOLINK_MOCK",
+  "EVOLINK_API_KEY",
   "VOLCENGINE_ACCESS_KEY_ID",
   "VOLCENGINE_SECRET_ACCESS_KEY",
   "ZHINIAN_WEBHOOK_SECRET"
@@ -33,6 +36,9 @@ describe("task management and public API helpers", () => {
     process.env.ZHINIAN_RUNTIME_DIR = runtimeDir;
     process.env.ZHINIAN_API_KEYS = "agent-a:secret-a,agent-b:secret-b";
     process.env.JIMENG_VISUAL_MOCK = "true";
+    delete process.env.IMAGE_GENERATE_ENGINE;
+    delete process.env.EVOLINK_MOCK;
+    delete process.env.EVOLINK_API_KEY;
     delete process.env.NEXT_PUBLIC_SUPABASE_URL;
     delete process.env.SUPABASE_SERVICE_ROLE_KEY;
     delete process.env.VOLCENGINE_ACCESS_KEY_ID;
@@ -91,6 +97,27 @@ describe("task management and public API helpers", () => {
     })).rejects.toBeInstanceOf(PublicApiConflictError);
   });
 
+  it("passes EvoLink quality through public image jobs", async () => {
+    process.env.IMAGE_GENERATE_ENGINE = "evolink";
+    process.env.EVOLINK_MOCK = "true";
+    process.env.EVOLINK_API_KEY = "test-key";
+    const result = await createPublicGenerationJob({
+      client: { id: "agent-a", key: "secret-a" },
+      request: new Request("http://local.test/api/v1/jobs"),
+      origin: "http://local.test",
+      body: {
+        capability: "image.generate",
+        prompt: "商品海报",
+        quality: "high"
+      }
+    });
+    expect(result.job.provider).toBe("mock");
+    expect(result.job.requestPayload.providerPayload).toMatchObject({
+      model: "gpt-image-2",
+      quality: "high"
+    });
+  });
+
   it("claims local jobs without duplicate ownership", async () => {
     await Promise.all(Array.from({ length: 6 }, (_, index) => createGenerationJob({
       ownerId: DEFAULT_OWNER_ID,