Add per-API-key quotas for `ApiKeyModule` (placeholder currently)

[mercy60]

Internal ID: #47

Imported from ISSUES.md via scripts/import-issues.mjs.

Problem Statement. @nestjs/terminus lists ApiKeyModule as imported in app.module.ts. The actual functionality is unknown; assume quotas/budgets.

Expected Outcome. API keys have per-tenant quotas: rate-limit, monthly request cap, scoped endpoints. Enforced via guard.

Acceptance Criteria.

• Issue an API key for a test tenant, verify quota enforcement.

Implementation Notes.

• Hash keys with Argon2id before storage.

Files / modules affected.

• backend/src/api-key/

Dependencies. None.

Difficulty / Effort. Medium / M (≈ 6 hours).

Labels. area:backend, feature

[Gogo-Eng]

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[Aisha000-0]

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Hello, maintainer i can fix this issue

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[Yinklekay]

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[ajulaybeeb]

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hi maintainer, i am a Full-Stack and web3 Developer, with 4+ years of experience. I have carefully read and understand the description of this issue, and i would like to take on this issue

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[ybmaorg]

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Hi, I'd like to work on this issue.

I'm a full-stack developer with solid experience in modern JavaScript/TypeScript, REST APIs, and frontend frameworks like React. I enjoy working in open source and following existing project conventions.

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[doctorlight0]

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I understand the objective of this issue and can provide a well-structured implementation that follows the project's conventions. I’m available to work on it.

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