fix: expose Grok image pricing controls

frontend/src/views/admin/GroupsView.vue

@@ -789,11 +789,7 @@
 
         <!-- 图片生成计费配置 -->
         <div
-          v-if="
-            createForm.platform === 'antigravity' ||
-            createForm.platform === 'gemini' ||
-            createForm.platform === 'openai'
-          "
+          v-if="supportsImagePricingPlatform(createForm.platform)"
           class="border-t pt-4"
         >
           <label
@@ -2128,11 +2124,7 @@
 
         <!-- 图片生成计费配置 -->
         <div
-          v-if="
-            editForm.platform === 'antigravity' ||
-            editForm.platform === 'gemini' ||
-            editForm.platform === 'openai'
-          "
+          v-if="supportsImagePricingPlatform(editForm.platform)"
           class="border-t pt-4"
         >
           <label
@@ -3216,6 +3208,7 @@ import {
 } from "./groupsModelsList";
 import { createModelsListCandidatesTracker } from "./groupsModelsListCandidates";
 import { normalizeSupportedModelScopesForPlatform } from "./groupsSupportedModelScopes";
+import { supportsImagePricingPlatform } from "./groupsImagePricing";
 
 const { t } = useI18n();
 const appStore = useAppStore();

frontend/src/views/admin/__tests__/groupsImagePricing.spec.ts

@@ -0,0 +1,17 @@
+import { describe, expect, it } from "vitest";
+
+import {
+  imagePricingPlatforms,
+  supportsImagePricingPlatform,
+} from "../groupsImagePricing";
+
+describe("groups image pricing platform support", () => {
+  it("includes Grok media groups", () => {
+    expect(supportsImagePricingPlatform("grok")).toBe(true);
+    expect(imagePricingPlatforms.has("grok")).toBe(true);
+  });
+
+  it("keeps non-media group platforms out of the image pricing controls", () => {
+    expect(supportsImagePricingPlatform("anthropic")).toBe(false);
+  });
+});

frontend/src/views/admin/groupsImagePricing.ts

@@ -0,0 +1,9 @@
+export const imagePricingPlatforms = new Set([
+  "antigravity",
+  "gemini",
+  "grok",
+  "openai",
+]);
+
+export const supportsImagePricingPlatform = (platform: string): boolean =>
+  imagePricingPlatforms.has(platform);