API Feature - Sorting & Formatting

[TNxRebel]

Prerequisite:
Wait for Basic API - Fetch All Issues to be In Progress or Done

Description:
The Frontend FE: Public Issue Feed specifically asks to see "what has already been reported" quickly. We need to ensure the newest issues appear at the top.

Checklist:

• Modify the GET /api/issues controller.

• Add sorting logic: Sort by createdAt in descending order (Newest first).

• (Optional) If the description is huge, limit it to the first 100 characters? (Discuss with FE).

• Test: Create 3 issues with different times. Check the API response to verify the newest one is Index 0 in the array.