fix : validate repo names in languages route

[tmdeveloper007]

Summary of What Needs to be Done:
The languages route at src/app/api/metrics/languages/route.ts uses repo names directly in GitHub API URLs without validation. Malformed repo names could cause issues.

Changes that Need to be Made:

• File: src/app/api/metrics/languages/route.ts (lines 47-56)
• Add regex validation for repo names before fetching

Impact that it would Provide:

• Prevents invalid API requests
• Makes the code more robust against malformed input

[github-actions]

✅ Closed as completed!

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