feat(web): 模型能力 - Agnes 图像协议补充比例档位与单次张数默认值

web/test/image-resolution-tiers.test.ts

@@ -8,7 +8,7 @@ import {
     imageSizeForResolution,
     supportsImageResolutionPresets,
 } from "../src/lib/image-resolution-tiers";
-import { defaultImageCapabilityConfig } from "../src/lib/model-capabilities";
+import { defaultImageCapabilityConfig, normalizeImageValue } from "../src/lib/model-capabilities";
 import { resolveImageRequestSize } from "../src/services/api/image-validation";
 
 const sizes = [
@@ -65,6 +65,23 @@ describe("image resolution tiers", () => {
         expect(buildImageResolutionOptions(profile.size.values)).toHaveLength(30);
     });
 
+    // Agnes 图像的 size 是官方必填项，但取分辨率档位，画面比例走独立的 ratio 字段，
+    // 所以界面必须同时保留比例和档位两个选择器，不能退化成 OpenAI 的像素尺寸。
+    test("Agnes 图像按比例加档位选择尺寸，并关闭上游不支持的输出开关", () => {
+        const profile = defaultImageCapabilityConfig("agnes-image", "agnes-image-2.1-flash");
+
+        expect(profile.size.parameter).toBe("aspect_ratio");
+        expect(profile.size.values).toEqual(["1:1", "3:4", "4:3", "16:9", "9:16", "2:3", "3:2", "21:9"]);
+        expect(profile.quality.values).toEqual(["1k", "2k", "4k"]);
+        expect(normalizeImageValue(profile, { size: "3:4", quality: "4k", count: "4" })).toMatchObject({ size: "3:4", quality: "4k", count: "1" });
+
+        // 顶层 response_format 是官方明确列出的错误写法，output_format 会被上游直接拒绝。
+        expect(profile.responseFormat.supported).toBe(false);
+        expect(profile.outputFormat.supported).toBe(false);
+        expect(profile.transparentBackground.supported).toBe(false);
+        expect(profile.references.maskSupported).toBe(false);
+    });
+
     test("识别适合全景图的 2:1 自定义尺寸", () => {
         const options = buildImageResolutionOptions(["1440x720", "2048x1024", "3840x1920"]);