logging functionality added

[SudiptaPaul-31]

🚀 Integrate Structured Logging with nestjs-pino

📌 Overview

This PR replaces the default NestJS console logger with structured JSON logging using nestjs-pino.

Structured logging improves observability and enables better log aggregation, searching, and monitoring in production environments using tools like Datadog, ELK Stack, or Grafana.

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resolves #123

✅ What’s Included

• Installed nestjs-pino and pino-http
• Added pino-pretty for local development
• Configured LoggerModule globally in AppModule
• Replaced default NestJS logger in main.ts
• Enabled:
  • 🧑‍💻 Pretty-printed logs in development
  • 🏭 Raw JSON logs in production
• Removed console.log usage
• Enabled bufferLogs to properly initialize logger before app bootstrap

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⚙️ Implementation Details

1️⃣ Logger Configuration (AppModule)

• Used LoggerModule.forRootAsync
• Dynamically configured log level based on NODE_ENV
• Enabled pino-pretty transport for non-production environments

2️⃣ Bootstrap Changes (main.ts)

• Enabled bufferLogs
• Replaced Nest default logger:

  app.useLogger(app.get(Logger));

• Logged application startup using structured logger

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