perf(tickets): Implement Server-Side Pagination, Filtering, and Sorting on GET /tickets Endpoint (#3978)

[knoxiboy]

Description

Implements a server-side ticket pagination, multi-attribute filtering, and field sorting service (backend/services/ticket_pagination_service.py) for the GET /tickets API endpoint to reduce memory consumption and speed up admin dashboard load times.

Related Issue

Fixes #3978

Type of Change

• Bug fix (non-breaking change which fixes an issue)
• New feature (non-breaking change which adds functionality)
• Breaking change (fix or feature that would cause existing functionality to not work as expected)
• Documentation update
• Configuration change

Checklist

• My code follows the project's coding style
• I have performed a self-review of my code
• I have commented my code where necessary
• I have updated the documentation accordingly
• My changes generate no new warnings
• I have added tests that prove my fix is effective or my feature works
• New and existing unit tests pass locally with my changes

Additional Notes

Supports page size limits (default: 20, max: 100) and multi-column sorting.

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