[Backend] Add Pagination Metadata to Notification APIs

[Abd-Standard]

Description

Return standardized pagination information with list endpoints.

Acceptance Criteria
Response includes total pages and item count.
Existing clients remain compatible.
Documentation is updated.

[Emmo00]

I would love to work on this issue

[TeeYml]

hi maintainer can i help fix this issue? i will add standardized pagination metadata to the notification list endpoints ensuring the response includes total pages and item count while maintaining backward compatibility for existing clients. I'll also update the API documentation to reflect the new response format

[deep-bhikadiya]

Hi, I’ve worked on Stellar open-source contributions through Drips Wave before. I’m interested in this one too—please assign it to me and I’ll get started.

[Banx17]

Good day team, i will love to take on this issue, please kindly assign

[Ved-viraj]

Hi, can I be assigned this issue please? I’ve gone through the issue carefully and I’m up for the task, kindly assign me please

[grantfox-oss]

🦊 GrantFox — @Ved-viraj has been assigned to this issue as part of the Official Campaign campaign!

Next steps:

1. Open a Pull Request referencing this issue (e.g., Closes #104)
2. Your PR will be reviewed by the Core-Foundry maintainers

Good luck! Track your progress on GrantFox.

[grantfox-oss]

🎉 This issue has been marked as completed on GrantFox as part of the Official Campaign campaign!

@Ved-viraj's PR #166 was approved and merged by @Abd-Standard.

🏆 @Ved-viraj: You earned 35 FoxPoints for this contribution! Your current tier: Explorer (401 total points). Track your full progress on GrantFox.

👏 Great work, @Ved-viraj! Keep contributing to Core-Foundry.