feat: add pagination to governance proposals list

[sammajayi]

Summary

Added totalPages to the governance proposals API response and added a "Page no of all page" indicator to the DAO Proposals page.

Type of Change

• Bug fix
• [x ] New feature
• Smart contract change
• Documentation
• Breaking change
• Other (please describe)

Checklist

• Tests added or updated
• [x ] No hardcoded secrets or private keys
• If contract change: cargo test passes
• If frontend change: npm run typecheck passes
• If backend change: npm test passes
• Related issues linked (Closes feat: add pagination to governance proposals list #511 )
• [ x] Self-review completed
• Code follows project style guidelines

Screenshots (if applicable)

Testing

Additional Notes

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