feat(ui): add identity management for tenants and users

* Implement tenant and user creation in IdentityPage
* Add API calls for managing tenants and users
* Introduce tenant-scoped API requests
* Update sidebar to include identity navigation
* Create BooleanStatusBadge component for key status

internal/app/app.go

@@ -91,6 +91,14 @@ func Run(ctx context.Context, configPath string) error {
 		if err != nil {
 			return err
 		}
+	} else {
+		keyring = auth.NewManagedKeyring()
+	}
+	if err := ensureConfiguredTenants(ctx, db.Pool(), keyring); err != nil {
+		return fmt.Errorf("create configured tenants: %w", err)
+	}
+	if err := loadIdentityKeyring(ctx, db.Pool(), keyring); err != nil {
+		return fmt.Errorf("load identity key assignments: %w", err)
 	}
 	tokenStore = auth.NewTokenStore(0)
 	if len(cfg.Auth.OAuth.Clients) > 0 {
@@ -192,6 +200,7 @@ func routes(logger *slog.Logger, cfg *config.Config, info buildinfo.Info, db *st
 	enrichmentRetryer := tools.NewEnrichmentRetryer(context.Background(), db, bgMetadata, cfg.Capture, cfg.AI.Metadata.Timeout, activeProjects, logger)
 	backfillTool := tools.NewBackfillTool(db, bgEmbeddings, activeProjects, logger)
 	adminActions := newAdminActions(backfillTool, enrichmentRetryer, logger)
+	identityAdmin := newIdentityAdmin(db.Pool(), keyring, logger)
 
 	toolSet := mcpserver.ToolSet{
 		Capture:              tools.NewCaptureTool(db, embeddings, cfg.Capture, activeProjects, enrichmentRetryer, backfillTool),
@@ -246,6 +255,8 @@ func routes(logger *slog.Logger, cfg *config.Config, info buildinfo.Info, db *st
 	mux.HandleFunc("/api/oauth/token", oauthTokenHandler(oauthRegistry, tokenStore, authCodes, logger))
 	mux.Handle("/api/admin/actions/backfill", authMiddleware(adminActions.backfillHandler()))
 	mux.Handle("/api/admin/actions/retry-metadata", authMiddleware(adminActions.retryMetadataHandler()))
+	mux.Handle("/api/admin/identity", authMiddleware(identityAdmin.handler()))
+	mux.Handle("/api/admin/identity/", authMiddleware(identityAdmin.handler()))
 	mux.HandleFunc("/favicon.ico", serveFavicon)
 	mux.HandleFunc("/images/project.jpg", serveHomeImage)
 	mux.HandleFunc("/images/icon.png", serveIcon)