fix: Correct NestJS start script path

🔧 Fix NestJS Start Path

## Issue Identified:
- NestJS build creates files in dist/src/ directory
- Start script was looking for dist/main.js (wrong path)
- Debug output showed main.js NOT FOUND in dist/

## Solution:
- Updated start script: 'node dist/main.js' → 'node dist/src/main.js'
- NestJS build output goes to dist/src/ not dist/

## Key Change:
- package.json: Fixed start script path to match actual build output
- NestJS compiles TypeScript to dist/src/ directory structure

This fixes the production deployment where the container
couldn't find the main.js file because it was in the wrong location.

Author: gnowgi

nodebook-base/package.json

@@ -6,7 +6,7 @@
   "type": "module",
   "scripts": {
     "test": "jest",
-    "start": "node dist/main.js",
+    "start": "node dist/src/main.js",
     "dev": "npx nest start --watch",
     "build": "npx nest build",
     "start:legacy": "node server.js",