Merge branch 'main' into test

# Conflicts:
#	backend/cmd/server/VERSION
#	backend/ent/migrate/schema.go
#	backend/ent/mutation.go
#	backend/ent/runtime/runtime.go
#	backend/ent/usagelog.go
#	backend/ent/usagelog/usagelog.go
#	backend/ent/usagelog/where.go
#	backend/ent/usagelog_create.go
#	backend/ent/usagelog_update.go
#	backend/internal/repository/usage_log_repo.go
#	backend/internal/server/api_contract_test.go
#	backend/internal/server/middleware/cors.go
#	backend/internal/service/gateway_service.go

frontend/src/components/account/BulkEditAccountModal.vue

@@ -710,6 +710,7 @@ const groupIds = ref<number[]>([])
 // All models list (combined Anthropic + OpenAI)
 const allModels = [
   { value: 'claude-opus-4-6', label: 'Claude Opus 4.6' },
+  { value: 'claude-sonnet-4-6', label: 'Claude Sonnet 4.6' },
   { value: 'claude-opus-4-5-20251101', label: 'Claude Opus 4.5' },
   { value: 'claude-sonnet-4-20250514', label: 'Claude Sonnet 4' },
   { value: 'claude-sonnet-4-5-20250929', label: 'Claude Sonnet 4.5' },
@@ -757,6 +758,13 @@ const presetMappings = [
     color:
       'bg-purple-100 text-purple-700 hover:bg-purple-200 dark:bg-purple-900/30 dark:text-purple-400'
   },
+  {
+    label: 'Sonnet 4.6',
+    from: 'claude-sonnet-4-6',
+    to: 'claude-sonnet-4-6',
+    color:
+      'bg-purple-100 text-purple-700 hover:bg-purple-200 dark:bg-purple-900/30 dark:text-purple-400'
+  },
   {
     label: 'Opus->Sonnet',
     from: 'claude-opus-4-5-20251101',