feat(antigravity,gemini): add Gemini 3.8 Flash support and bump IDE fingerprint to 2.11.0

Co-authored-by: Schnee111 <daffamaarif.dev@gmail.com>
Co-authored-by: AhooraZen <ahoora935137@gmail.com>
Co-authored-by: anojndr <anojndr@gmail.com>
Co-authored-by: Emirhan <emirhan551952@gmail.com>

open-sse/services/usage/google.js

@@ -161,6 +161,9 @@ export async function getAntigravityUsage(accessToken, providerSpecificData, pro
     if (data.models) {
       // Filter only recommended/important models (must match PROVIDER_MODELS ag ids)
       const importantModels = [
+        'gemini-3.8-flash-high',
+        'gemini-3.8-flash-medium',
+        'gemini-3.8-flash-low',
         'gemini-3.7-flash-high',
         'gemini-3.7-flash-medium',
         'gemini-3.7-flash-low',