Refactor imports and clean up whitespace in API and runner client files. Update auth package references to use the new package structure. Improve mutex usage in the runner client for better concurrency handling.

internal/api/admin.go

@@ -7,8 +7,6 @@ import (
 	"net/http"
 	"time"
 
-	"github.com/go-chi/chi/v5"
-	"fuego/internal/auth"
 	"fuego/pkg/types"
 )
 
@@ -22,7 +20,7 @@ func (s *Server) handleGenerateRegistrationToken(w http.ResponseWriter, r *http.
 
 	// Default expiration: 24 hours
 	expiresIn := 24 * time.Hour
-	
+
 	var req struct {
 		ExpiresInHours int `json:"expires_in_hours,omitempty"`
 	}
@@ -39,9 +37,9 @@ func (s *Server) handleGenerateRegistrationToken(w http.ResponseWriter, r *http.
 	}
 
 	s.respondJSON(w, http.StatusCreated, map[string]interface{}{
-		"token":       token,
-		"expires_in":  expiresIn.String(),
-		"expires_at":  time.Now().Add(expiresIn),
+		"token":      token,
+		"expires_in": expiresIn.String(),
+		"expires_at": time.Now().Add(expiresIn),
 	})
 }
 
@@ -169,4 +167,3 @@ func (s *Server) handleListRunnersAdmin(w http.ResponseWriter, r *http.Request)
 
 	s.respondJSON(w, http.StatusOK, runners)
 }
-