Feat v0.7.7 API tokens + extension permissions (#61)

Personal access tokens (PATs) for programmatic API access with
SHA-256 hashing, permission scoping (git model), and Settings/Admin UI.
Extension-declared user permissions with dynamic registry, gate_permission
manifest field, permissions Starlark module, and grouped admin UI.

Co-Authored-By: Claude Opus 4.6 (1M context) <noreply@anthropic.com>

server/store/interfaces.go

@@ -62,6 +62,7 @@ type Stores struct {
 	Triggers        TriggerStore
 	ScheduledTasks  ScheduledTaskStore
 	Cluster         ClusterStore
+	APITokens       APITokenStore
 }
 
 // TeamAvailableModel is returned by CatalogStore.ListTeamAvailable.