Add Notification Template Management

[Abd-Standard]

Description

Create reusable templates for frequently sent notifications.

Tasks
Store notification templates.
Support variable placeholders.
Validate template rendering.
Expose CRUD operations.

Acceptance Criteria
Templates can be created and updated.
Placeholders render correctly.
Invalid templates return validation errors.

[jabir-dev788]

Hey, I’d love to work on this issue if it’s available 🙏
I've reviewed this issue and have a clear approach to fix it. I can deliver a clean, minimal PR within 5

[grantfox-oss]

🦊 GrantFox — @canicefavour 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 #33)
2. Your PR will be reviewed by the Core-Foundry maintainers

Good luck! Track your progress on GrantFox.

[my908-hue]

@my908-hue has applied to work on this issue as part of the Stellar Wave Program's 6th wave.

Hi maintainer i would love to work on this project Store notification templates.
Support variable placeholders.Validate template rendering.Expose CRUD operations.

ℹ️ Repo Maintainers: To accept this application, review their application or assign @my908-hue to this issue.

[drips-wave]

Congratulations, @my908-hue! 🎉 Your application was accepted by the repo's maintainers, and the issue is due on June 30, 2026.

🧑‍💻 @my908-hue: Please resolve the issue such that the repo's maintainers have enough time to review your contribution before the due date. You'll earn Points for completing the issue on-time, which will make you eligible for a share of the Stellar Wave Program's reward pool.

Warning

When opening a PR, please link it to this issue to ensure it gets tracked accurately. Points are awarded when this issue is marked as completed by the maintainer.

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