Remove user credentials from environment example and clean up server logging

Author: Eric-Philippe

.env.example

@@ -1,7 +1,4 @@
 # Server configuration
 SERVER_NAME=BeeAPI Go
 SERVER_DESCRIPTION=Development Server
-
-# User credentials
-USER_ADMIN=admin123
-USER_TEST=test123
+SERVER_PORT=5000

main.go

@@ -130,7 +130,6 @@ func main() {
 	// Run server in a goroutine so it doesn't block
 	go func() {
 		log.Printf("Server starting on port %s", port)
-		log.Printf("API Key: %s", apiKeyManager.GetAPIKey())
 		if err := srv.ListenAndServe(); err != nil && err != http.ErrServerClosed {
 			log.Fatalf("Server error: %v", err)
 		}