Ref : Implemented strict Zod request schema validation in scheme eligibility checker

[hrx01-dev]

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📋 PR Summary & Link

• **Closes [Security/Refactor] Implement strict Zod request schema validation in scheme eligibility checker #2104 **
• Summary:
• Defined a Strict Zod Schema: Created an eligibilitySchema to properly parse and enforce requirements on the incoming request body, such as rejecting negative numbers for age and annual_income, and making sure family_size is at least 1.
• Replaced Unsafe Type Casting: The route now parses the payload using eligibilitySchema.safeParse(req.body) instead of unsafely typing the request with as EligibilityBody.
• Error Handling: If validation fails, the API gracefully rejects the request by immediately returning a 400 Bad Request containing the specific validation issues before executing any processing logic.

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🏷️ PR Type

• 🐛 type: bug
• ✨ type: feature
• 📖 type: docs
• 🧪 type: testing
• 🔒 type: security
• ⚡ type: performance
• 🎨 type: design
• ♻️ type: refactor
• 🛠️ type: devops
• ♿ type: accessibility

✅ Checklist

• My PR has a linked issue (Closes #123)
• I have pulled the latest main and resolved any conflicts

[github-actions]

🎉 Congratulations @hrx01-dev! Your Pull Request "Ref : Implemented strict Zod request schema validation in scheme eligibility checker " has been successfully merged by @dipexplorer.

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