fix : add security category to CATEGORY_BADGE and menu in search_projects

[tmdeveloper007]

Summary of What Has Been Done

In search_projects.py, the CATEGORY_BADGE dict was missing the "security" category even though the codebase has a security/ directory with projects. This caused projects in the security category to display as "Unknown" in the search results.

Additionally, the interactive menu's category listing and validation only included games, math, and utilities, excluding security.

Changes Made

1. Added "security": "🛡️ Security" to CATEGORY_BADGE.
2. Updated the menu prompt to include security in the categories list.
3. Updated the validation to accept security as a valid category filter.

Impact it Made

• Security projects now display correctly with a proper badge in search results.
• Users can filter and browse security-category projects through the interactive menu.

Closes #1861.

Note: Please assign this PR to the tmdeveloper007 account.

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