feat: display Copilot premium interactions quota on provider card

Copilot usage query API was implemented but never surfaced on the main
provider list. Add CopilotQuotaFooter component that auto-detects
github_copilot providers and displays premium interaction utilization
inline, reusing the existing TierBadge UI from SubscriptionQuotaFooter.

src/i18n/locales/en.json

@@ -2353,6 +2353,7 @@
     "geminiFlash": "Flash",
     "geminiFlashLite": "Flash Lite",
     "weeklyLimit": "Weekly",
+    "copilotPremium": "Premium",
     "utilization": "{{value}}%",
     "resetsIn": "Resets in {{time}}",
     "extraUsage": "Extra Usage",

src/i18n/locales/ja.json

@@ -2353,6 +2353,7 @@
     "geminiFlash": "Flash",
     "geminiFlashLite": "Flash Lite",
     "weeklyLimit": "週間",
+    "copilotPremium": "プレミアム",
     "utilization": "{{value}}%",
     "resetsIn": "{{time}}後にリセット",
     "extraUsage": "超過使用量",

src/i18n/locales/zh.json

@@ -2353,6 +2353,7 @@
     "geminiFlash": "Flash",
     "geminiFlashLite": "Flash Lite",
     "weeklyLimit": "每周",
+    "copilotPremium": "高级请求",
     "utilization": "{{value}}%",
     "resetsIn": "{{time}}后重置",
     "extraUsage": "超额用量",