Feature/developer repository

[Biokes]

Closes #12

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feat: Implement Developer Repository with CRUD Operations

Summary

Implements a complete developer repository with CRUD operations using TypeORM, supporting developer-to-user linking and API listing functionality.

Changes

Core Implementation

• DeveloperRepository with full CRUD operations:
• create(developer) - Create new developer
• findByUserId(userId) - Find developer by user ID
• findById(id) - Find developer by ID
• update(id, data) - Update developer information
• listApis(developerId) - List all APIs for a developer

Database Layer

• TypeORM Entities:
• Developer entity with OneToMany relationship to APIs
• Api entity with ManyToOne relationship to Developer
• Auto-generated UUIDs, timestamps (created_at, updated_at)

Error Handling

• Custom Error Classes:
• NotFoundError - Thrown when developer doesn't exist
• DatabaseError - Thrown on database operation failures
• Consistent error handling across all repository methods

Configuration

• Database configuration with TypeORM DataSource
• Environment variable support for database connection

Testing

• 17 comprehensive unit tests covering:
• All CRUD operations (success and failure cases)
• Edge cases (not found, empty results, no changes)
• Error handling scenarios
• 100% test coverage:
• 100% statements
• 100% branches
• 100% functions
• 100% lines

[greatest0fallt1me]

@Biokes Can you resolve the conflicts?