feat: enhance Antigravity account overages handling and improve UI credit display

backend/internal/service/admin_service.go

@@ -1538,6 +1538,13 @@ func (s *adminServiceImpl) UpdateAccount(ctx context.Context, id int64, input *U
 			}
 		}
 		account.Extra = input.Extra
+		if account.Platform == PlatformAntigravity && wasOveragesEnabled && !account.IsOveragesEnabled() {
+			delete(account.Extra, antigravityCreditsOveragesKey)
+		}
+		if account.Platform == PlatformAntigravity && !wasOveragesEnabled && account.IsOveragesEnabled() {
+			delete(account.Extra, modelRateLimitsKey)
+			delete(account.Extra, antigravityCreditsOveragesKey)
+		}
 		// 校验并预计算固定时间重置的下次重置时间
 		if err := ValidateQuotaResetConfig(account.Extra); err != nil {
 			return nil, err
@@ -1623,9 +1630,6 @@ func (s *adminServiceImpl) UpdateAccount(ctx context.Context, id int64, input *U
 	if account.Platform == PlatformAntigravity {
 		if !account.IsOveragesEnabled() && wasOveragesEnabled {
 			clearCreditsExhausted(account.ID)
-			if err := clearAntigravityCreditsOveragesState(ctx, s.accountRepo, account.ID); err != nil {
-				return nil, err
-			}
 		}
 		if account.IsOveragesEnabled() && !wasOveragesEnabled {
 			clearCreditsExhausted(account.ID)

backend/internal/service/admin_service_overages_test.go

@@ -0,0 +1,111 @@
+//go:build unit
+
+package service
+
+import (
+	"context"
+	"testing"
+	"time"
+
+	"github.com/stretchr/testify/require"
+)
+
+type updateAccountOveragesRepoStub struct {
+	mockAccountRepoForGemini
+	account     *Account
+	updateCalls int
+}
+
+func (r *updateAccountOveragesRepoStub) GetByID(ctx context.Context, id int64) (*Account, error) {
+	return r.account, nil
+}
+
+func (r *updateAccountOveragesRepoStub) Update(ctx context.Context, account *Account) error {
+	r.updateCalls++
+	r.account = account
+	return nil
+}
+
+func TestUpdateAccount_DisableOveragesClearsRuntimeStateBeforePersist(t *testing.T) {
+	accountID := int64(101)
+	repo := &updateAccountOveragesRepoStub{
+		account: &Account{
+			ID:       accountID,
+			Platform: PlatformAntigravity,
+			Type:     AccountTypeOAuth,
+			Status:   StatusActive,
+			Extra: map[string]any{
+				"allow_overages":   true,
+				"mixed_scheduling": true,
+				antigravityCreditsOveragesKey: map[string]any{
+					"claude-sonnet-4-5": map[string]any{
+						"activated_at": "2026-03-15T00:00:00Z",
+						"active_until": "2099-03-15T00:00:00Z",
+					},
+				},
+			},
+		},
+	}
+	setCreditsExhausted(accountID, time.Now().Add(time.Minute))
+	t.Cleanup(func() {
+		clearCreditsExhausted(accountID)
+	})
+
+	svc := &adminServiceImpl{accountRepo: repo}
+	updated, err := svc.UpdateAccount(context.Background(), accountID, &UpdateAccountInput{
+		Extra: map[string]any{
+			"mixed_scheduling": true,
+		},
+	})
+
+	require.NoError(t, err)
+	require.NotNil(t, updated)
+	require.Equal(t, 1, repo.updateCalls)
+	require.False(t, updated.IsOveragesEnabled())
+	require.False(t, isCreditsExhausted(accountID))
+
+	_, exists := repo.account.Extra[antigravityCreditsOveragesKey]
+	require.False(t, exists, "关闭 overages 时应在持久化前移除运行态")
+}
+
+func TestUpdateAccount_EnableOveragesClearsModelRateLimitsBeforePersist(t *testing.T) {
+	accountID := int64(102)
+	repo := &updateAccountOveragesRepoStub{
+		account: &Account{
+			ID:       accountID,
+			Platform: PlatformAntigravity,
+			Type:     AccountTypeOAuth,
+			Status:   StatusActive,
+			Extra: map[string]any{
+				"mixed_scheduling": true,
+				modelRateLimitsKey: map[string]any{
+					"claude-sonnet-4-5": map[string]any{
+						"rate_limited_at":     "2026-03-15T00:00:00Z",
+						"rate_limit_reset_at": "2099-03-15T00:00:00Z",
+					},
+				},
+			},
+		},
+	}
+	setCreditsExhausted(accountID, time.Now().Add(time.Minute))
+	t.Cleanup(func() {
+		clearCreditsExhausted(accountID)
+	})
+
+	svc := &adminServiceImpl{accountRepo: repo}
+	updated, err := svc.UpdateAccount(context.Background(), accountID, &UpdateAccountInput{
+		Extra: map[string]any{
+			"mixed_scheduling": true,
+			"allow_overages":   true,
+		},
+	})
+
+	require.NoError(t, err)
+	require.NotNil(t, updated)
+	require.Equal(t, 1, repo.updateCalls)
+	require.True(t, updated.IsOveragesEnabled())
+	require.False(t, isCreditsExhausted(accountID))
+
+	_, exists := repo.account.Extra[modelRateLimitsKey]
+	require.False(t, exists, "开启 overages 时应在持久化前清掉旧模型限流")
+}

frontend/src/components/account/AccountUsageCell.vue

@@ -290,30 +290,34 @@
           color="amber"
         />
 
-        <div v-if="antigravityAICreditsDisplay.length > 0" class="mt-1 space-y-0.5 text-[10px] text-gray-500 dark:text-gray-400">
+        <div v-if="antigravityAICreditsDisplay.length > 0" class="mt-1 flex flex-wrap gap-1">
           <div
             v-for="credit in antigravityAICreditsDisplay"
             :key="credit.creditType"
+            class="inline-flex items-center gap-1 rounded-full border border-amber-200 bg-amber-50 px-2 py-0.5 text-[10px] font-medium text-amber-700 dark:border-amber-800/50 dark:bg-amber-950/40 dark:text-amber-300"
           >
-            {{ t('admin.accounts.aiCreditsBalance') }}:
-            {{ credit.creditType }}
-            {{ credit.amount }}
-            <span v-if="credit.minimumBalance !== null">
-              (min {{ credit.minimumBalance }})
+            <span>⚡</span>
+            <span>{{ t('admin.accounts.aiCreditsBalance') }}</span>
+            <span>{{ credit.label }}</span>
+            <span class="font-mono">{{ credit.amount }}</span>
+            <span v-if="credit.minimumBalance !== null" class="text-[9px] opacity-75">
+              min {{ credit.minimumBalance }}
             </span>
           </div>
         </div>
       </div>
-      <div v-else-if="antigravityAICreditsDisplay.length > 0" class="space-y-0.5 text-[10px] text-gray-500 dark:text-gray-400">
+      <div v-else-if="antigravityAICreditsDisplay.length > 0" class="flex flex-wrap gap-1">
         <div
           v-for="credit in antigravityAICreditsDisplay"
           :key="credit.creditType"
+          class="inline-flex items-center gap-1 rounded-full border border-amber-200 bg-amber-50 px-2 py-0.5 text-[10px] font-medium text-amber-700 dark:border-amber-800/50 dark:bg-amber-950/40 dark:text-amber-300"
         >
-          {{ t('admin.accounts.aiCreditsBalance') }}:
-          {{ credit.creditType }}
-          {{ credit.amount }}
-          <span v-if="credit.minimumBalance !== null">
-            (min {{ credit.minimumBalance }})
+          <span>⚡</span>
+          <span>{{ t('admin.accounts.aiCreditsBalance') }}</span>
+          <span>{{ credit.label }}</span>
+          <span class="font-mono">{{ credit.amount }}</span>
+          <span v-if="credit.minimumBalance !== null" class="text-[9px] opacity-75">
+            min {{ credit.minimumBalance }}
           </span>
         </div>
       </div>
@@ -615,6 +619,7 @@ const antigravityAICreditsDisplay = computed(() => {
     .filter((credit) => (credit.amount ?? 0) > 0)
     .map((credit) => ({
       creditType: credit.credit_type || 'UNKNOWN',
+      label: formatAICreditTypeLabel(credit.credit_type || 'UNKNOWN'),
       amount: Number(credit.amount ?? 0).toFixed(0),
       minimumBalance: typeof credit.minimum_balance === 'number'
         ? Number(credit.minimum_balance).toFixed(0)
@@ -622,6 +627,11 @@ const antigravityAICreditsDisplay = computed(() => {
     }))
 })
 
+function formatAICreditTypeLabel(creditType: string): string {
+  if (creditType === 'GOOGLE_ONE_AI') return 'Google One AI'
+  return creditType
+}
+
 // Antigravity 账户类型（从 load_code_assist 响应中提取）
 const antigravityTier = computed(() => {
   const extra = props.account.extra as Record<string, unknown> | undefined

frontend/src/components/account/__tests__/AccountUsageCell.spec.ts

@@ -133,9 +133,9 @@ describe('AccountUsageCell', () => {
     await flushPromises()
 
     expect(wrapper.text()).toContain('admin.accounts.aiCreditsBalance')
-    expect(wrapper.text()).toContain('GOOGLE_ONE_AI')
+    expect(wrapper.text()).toContain('Google One AI')
     expect(wrapper.text()).toContain('25')
-    expect(wrapper.text()).toContain('(min 5)')
+    expect(wrapper.text()).toContain('min 5')
   })