chore: setup GraphQL and Prisma

[derianrddev]

📝 Setup GraphQL and Prisma

🛠️ Issue

• Closes [CHORE]: Setup GraphQL and Prisma #125

📖 Description

• This PR introduces GraphQL with Prisma and leaves the backend ready to handle queries and mutations.

✅ Changes made

• Added GraphQL setup using Apollo Server in NestJS.
• Integrated Prisma ORM for database management with PostgreSQL.
• Configured GraphQL schema using the Code-First approach.
• Created PrismaService to handle database connections in NestJS.
• Created categories table in PostgreSQL using Prisma to validate API functionality.
• Implemented GraphQL resolvers and DTOs for the categories resource.
• Updated backend documentation to reflect these changes.

🖼️ Media (screenshots/videos)

📜 Additional Notes

[danielcdz]

@derianrddev resolve the conflicts then feel free to squash and merge the PR