fix: correct Logger type import path in server/framework.ts

- Fix import path from '../utils/logger' to '../utils/logger/index'
- Resolve TypeScript error: has no exported member named 'Logger'
- Build now passes successfully without TypeScript errors

Author: FluxStack Team

core/server/framework.ts

@@ -2,7 +2,7 @@ import { Elysia } from "elysia"
 import type { FluxStackConfig, FluxStackContext, Plugin } from "../types"
 import type { PluginContext, PluginUtils } from "../plugins/types"
 import { getConfigSync, getEnvironmentInfo } from "../config"
-import { logger, type Logger } from "../utils/logger"
+import { logger, type Logger } from "../utils/logger/index"
 import { createTimer, formatBytes, isProduction, isDevelopment } from "../utils/helpers"
 
 export class FluxStackFramework {