Implement campaign category listing endpoint

[ayshadogo]

User Story:
As a visitor, I want to filter campaigns by category so that I can find relevant causes.
Acceptance Criteria:

• GET /campaigns?category=health returns filtered campaigns
• GET /campaigns/categories returns all categories with campaign counts
• Categories: health, education, environment, disaster-relief, community, other

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[vicistar-star]

@vicistar-star has applied to work on this issue as part of the Stellar Wave Program's 5th wave.

I’d like to work on this issue because category-based filtering is a fundamental discovery feature that helps users quickly find relevant campaigns while improving the overall usability of the platform. I have experience building REST APIs, query filtering logic, database aggregation endpoints, and test-driven backend features in Node.js/TypeScript environments. For this task, I would implement filtering support for GET /campaigns?category=<category>, add a GET /campaigns/categories endpoint that returns all supported categories with their respective campaign counts, ensure validation for the defined category set (health, education, environment, disaster-relief, community, other), and add comprehensive tests covering filtering behavior, count aggregation, empty results, and invalid category scenarios. I would also ensure the implementation is efficient, well-documented, and consistent with the existing API architecture and coding standards.

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

[Daggahh]

@Daggahh has applied to work on this issue as part of the Stellar Wave Program's 5th wave.

Hello Maintainer, I'd love to work on this issue

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

[feyishola]

@feyishola has applied to work on this issue as part of the Stellar Wave Program's 5th wave.

Hi im Feyishola a software developer with over 4 years of experience. Please let me handle this issue

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

[drips-wave]

Congratulations, @feyishola! 🎉 Your application was accepted by the repo's maintainers, and the issue is due on June 2, 2026.

🧑‍💻 @feyishola: 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.

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