feat: setup Prisma ORM with PostgreSQL

[Elham-EN]

Summary

• Added Docker Compose setup for PostgreSQL 17
• Configured Prisma ORM v7 with PostgreSQL adapter
• Created Task model with enums and indexes
• Implemented POST /api/v1/tasks endpoint
• Added OpenAPI/Swagger documentation
• Fixed environment variable loading for ES modules
• Added Prisma client generation to CI workflow

Database Setup

• PostgreSQL running in Docker container
• Migrations applied successfully
• Task table created with all required fields

Testing

Test the endpoint at http://localhost:3000/docs using Swagger UI