implemented the branch module establishing relationship

[Kaylahray]

Branches, Departments, and Company Modules with Asset Integration. closes #339

Key Features Implemented

• Branches Module
  Handles company physical locations with CRUD APIs, including name, location, and linked company ID.

• Departments Module
  Represents business units within companies and branches, fully relational with Department CRUD endpoints.

• Company Module
  Supports companies with basic information and relations to branches and departments.

• Asset Entity Update
  Enhanced the existing asset entity to optionally relate to branches, aligning asset management with company locations.

• All modules include strong entity definitions using TypeORM with relations.

• Input validation with DTOs using class-validator.

• Services encapsulate business logic for CRUD operations.

• RESTful controllers expose the APIs to interact with these modules.

• The project follows NestJS best practices for modular architecture and maintainability.

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