新增优化案例领域模型

src/lib/domain/__tests__/validation.test.ts

@@ -66,6 +66,22 @@ describe("domain validation", () => {
       goal: "保留原意，减少 AI 味",
       intensity: "light",
       user_instructions: "保留口语感",
+      publish_target: "未指定",
+    });
+  });
+
+  it("validates human-copy publish target", () => {
+    expect(
+      copyOptimizationRequestSchema.parse({
+        source_text: "这是一段普通文案。",
+        goal: "",
+        intensity: "light",
+        user_instructions: "",
+        publish_target: "朋友圈",
+      }),
+    ).toMatchObject({
+      goal: "保留原意，减少 AI 味",
+      publish_target: "朋友圈",
     });
   });