[Bug] Fix duplicate imports and conflicting declarations in `auth.service.ts`

[kingksjo]

Domain: Auth

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Issue [Bug] Fix duplicate imports and conflicting declarations in auth.service.ts

Tier: 🔴 Hard

Description:

• Problem: src/modules/auth/auth.service.ts has duplicate import statements that prevent compilation. UserModel, OrganizationModel, and blockToken are each imported twice from the same modules (lines 6 and 8, lines 9 and 11). Additionally, the TokenPayload interface declares jti twice — once as optional and once as required — which is a TypeScript error. The file cannot compile in its current state, blocking all authentication functionality.
• Implementation: Remove the duplicate import lines (keeping one of each). Resolve the jti field in TokenPayload to a single declaration (it should be required since it is used for token revocation). Verify the file compiles cleanly with npm run build.

Dependencies:

• Depends on None

Acceptance Criteria:

• Each module is imported exactly once with no duplicate import lines.
• TokenPayload.jti is declared once as a required string field.
• npm run build compiles without errors.
• All existing auth tests continue to pass.
• Proper HTTP status codes and our standard JSON response wrapper are used.
• Edge cases (e.g., missing data, unauthorized roles) are handled gracefully.

Testing Requirements:

• Run full auth test suite (auth.test.ts, auth.controllers.test.ts) to confirm no regressions.
• Unit tests written for the core logic (target 80%+ coverage).
• External API calls or database connections are mocked in unit tests.
• Postman collection or Swagger spec updated (if this adds/modifies an endpoint).

PR Checklist:

• Branch is named conventionally (e.g., fix/issue-41-auth-service-duplicate-imports).
• npm run lint and npm run build pass with zero warnings.
• Screenshot of passing Jest terminal logs is attached to the PR.
• Database migrations/seed scripts updated (if applicable).

[Stanley-Owoh]

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

Good day maintainer please i would like to work on this issue i am conversant with this
Please assign it to me i can work on it immediately. Thank you

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

[Jerry-Tekh]

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

Hi maintainer, I will work on this conflicting declaration and ensure all declaration are implemented correctly. This will be done within the required timeframe..

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