API: Fetch projects by organization

[vprashrex]

Is your feature request related to a problem?
The API currently cannot fetch projects by organization, lacks pagination metadata such as has_more for organization listings, and has insufficient validation and documentation.

Describe the solution you'd like

• Introduce GET /projects/organization/{org_id} endpoint with validation
• Add has_more pagination to organization listings
• Improve Swagger documentation

Original issue

Describe the current behavior
The API does not support fetching projects by organization, lacks pagination metadata like has_more in organization listings, and has limited validation and documentation.

Describe the enhancement you'd like
GET /projects/organization/{org_id} endpoint with validation, add has_more pagination to organization listings, and improve Swagger documentation.

Why is this enhancement needed?
It enhances API usability, ensures proper validation, improves pagination handling, and provides better developer clarity through documentation.

Additional context
Add any other context, metrics, screenshots, or examples about the enhancement here.