feat: update to June 2026 models (Claude Sonnet 4.6, Gemini 3.5 Flash), add glossary button, and implement cost factor quota & vision fallback

services/auth_service.py

@@ -501,19 +501,21 @@ def check_usage_limits(user: User) -> Dict[str, Any]:
     }
 
 
-def record_usage(user_id: str, pages_count: int, use_credits: bool = False) -> bool:
-    """Record document translation usage"""
+def record_usage(
+    user_id: str, pages_count: int, use_credits: bool = False, cost_factor: int = 1
+) -> bool:
+    """Record document translation usage with optional cost factor depending on AI model"""
     user = get_user_by_id(user_id)
     if not user:
         return False
 
     updates = {
-        "docs_translated_this_month": user.docs_translated_this_month + 1,
-        "pages_translated_this_month": user.pages_translated_this_month + pages_count,
+        "docs_translated_this_month": user.docs_translated_this_month + cost_factor,
+        "pages_translated_this_month": user.pages_translated_this_month + (pages_count * cost_factor),
     }
 
     if use_credits:
-        updates["extra_credits"] = max(0, user.extra_credits - pages_count)
+        updates["extra_credits"] = max(0, user.extra_credits - (pages_count * cost_factor))
 
     result = update_user(user_id, updates)
     return result is not None