feat: replace gemini-3-pro-image with gemini-3.1-flash-image

- Add migration 060 to update model_mapping for all antigravity accounts
- Remove gemini-3-pro-image and gemini-3-pro-image-preview mappings
- Add gemini-3.1-flash-image and gemini-3.1-flash-image-preview mappings
- Update frontend usage window to show GImage for new model
- Update isImageGenerationModel to support new model

frontend/src/components/account/AccountStatusIndicator.vue

@@ -181,6 +181,7 @@ const formatScopeName = (scope: string): string => {
     'gemini-3.1-pro-high': 'G3PH',
     'gemini-3.1-pro-low': 'G3PL',
     'gemini-3-pro-image': 'G3PI',
+    'gemini-3.1-flash-image': 'GImage',
     // 其他
     'gpt-oss-120b-medium': 'GPT120',
     'tab_flash_lite_preview': 'TabFL',

frontend/src/components/account/AccountUsageCell.vue

@@ -397,8 +397,8 @@ const antigravity3ProUsageFromAPI = computed(() =>
 // Gemini 3 Flash from API
 const antigravity3FlashUsageFromAPI = computed(() => getAntigravityUsageFromAPI(['gemini-3-flash']))
 
-// Gemini 3 Image from API
-const antigravity3ImageUsageFromAPI = computed(() => getAntigravityUsageFromAPI(['gemini-3-pro-image']))
+// Gemini Image from API
+const antigravity3ImageUsageFromAPI = computed(() => getAntigravityUsageFromAPI(['gemini-3.1-flash-image']))
 
 // Claude from API (all Claude model variants)
 const antigravityClaudeUsageFromAPI = computed(() =>

frontend/src/components/keys/UseKeyModal.vue

@@ -864,8 +864,8 @@ function generateOpenCodeConfig(platform: string, baseUrl: string, apiKey: strin
         }
       }
     },
-    'gemini-3-pro-image': {
-      name: 'Gemini 3 Pro (Image)',
+    'gemini-3.1-flash-image': {
+      name: 'Gemini 3.1 Flash Image',
       limit: {
         context: 1048576,
         output: 65536

frontend/src/composables/useModelWhitelist.ts

@@ -91,10 +91,10 @@ const antigravityModels = [
   'gemini-3-flash',
   'gemini-3-pro-high',
   'gemini-3-pro-low',
-  'gemini-3-pro-image',
   // Gemini 3.1 系列
   'gemini-3.1-pro-high',
   'gemini-3.1-pro-low',
+  'gemini-3.1-flash-image',
   // 其他
   'gpt-oss-120b-medium',
   'tab_flash_lite_preview'

frontend/src/i18n/locales/en.ts

@@ -1133,7 +1133,7 @@ export default {
       },
       imagePricing: {
         title: 'Image Generation Pricing',
-        description: 'Configure pricing for gemini-3-pro-image model. Leave empty to use default prices.'
+        description: 'Configure pricing for image generation models. Leave empty to use default prices.'
       },
       soraPricing: {
         title: 'Sora Per-Request Pricing',
@@ -2047,7 +2047,7 @@ export default {
         geminiFlashDaily: 'Flash',
         gemini3Pro: 'G3P',
         gemini3Flash: 'G3F',
-        gemini3Image: 'G3I',
+        gemini3Image: 'GImage',
         claude: 'Claude'
       },
       tier: {

frontend/src/i18n/locales/zh.ts

@@ -1220,7 +1220,7 @@ export default {
       },
       imagePricing: {
         title: '图片生成计费',
-        description: '配置 gemini-3-pro-image 模型的图片生成价格，留空则使用默认价格'
+        description: '配置图片生成模型的图片生成价格，留空则使用默认价格'
       },
       soraPricing: {
         title: 'Sora 按次计费',
@@ -1582,7 +1582,7 @@ export default {
         geminiFlashDaily: 'Flash',
         gemini3Pro: 'G3P',
         gemini3Flash: 'G3F',
-        gemini3Image: 'G3I',
+        gemini3Image: 'GImage',
         claude: 'Claude'
       },
       tier: {