[WIP] Epic: AWS Serverless Migration

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AWS Serverless Migration Epic - Phase 1: Project & Infrastructure Setup

This PR implements Phase 1 of the AWS Serverless Migration Epic, focusing on the foundational infrastructure setup.

Progress Checklist:

• Phase 1: Project & Infrastructure Setup

  • Initialize AWS SAM project in a new serverless-backend directory
  • Define DynamoDB tables for all data models (Users, Urls, Admins, etc.) in template.yaml

• Phase 2: Authentication

  • Define Cognito User Pools for users and admins in template.yaml
  • Refactor all authentication routes (login, signup, password-reset) into Lambda functions using Cognito

• Phase 3: Core Business Logic

  • Refactor URL management endpoints into Lambda functions
  • Refactor admin and feedback management endpoints into Lambda functions
  • Refactor custom domain logic into a Lambda function

• Phase 4: Background Jobs & Services

  • Migrate node-cron job to a Lambda triggered by an EventBridge schedule
  • Replace nodemailer with Amazon SES for all email sending

• Phase 5: Deployment & Verification

  • Deploy the complete serverless stack using sam deploy
  • Conduct end-to-end testing of all API endpoints
  • Update frontend to point to the new API Gateway endpoint
  • Decommission the old EC2-based backend

Data Models Analysis:

Analyzed existing MongoDB models that need DynamoDB equivalents:

• Users: email, password, name, isEmailVerified, customDomain, timestamps
• Admins: email, password, name, isEmailVerified, timestamps
• URLs: userId, shortUrl, originalUrl, category, visitCount, customBackHalf, timestamps
• CustomDomains: url, dnsVerificationCode, isVerified, user
• Feedback: email, name, message, rating, timestamps

Current Status:

• ✅ Repository exploration and architecture analysis complete
• ✅ AWS SAM CLI confirmed available
• 🔄 Ready to begin Phase 1 implementation

Fixes #187.

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