feat(microservices): add badge-verification, clans, sponsorship skeletons

[dDevAhmed]

Summary

This PR adds three new minimal NestJS microservices under microservices/:

• badge-verification-service — generates badge proofs, builds Merkle-style proofs, simulates on-chain commit, supports revocation, expiration, and shareable proof links.
• clans-service — supports clan creation, hierarchical parent linking, territory claims, conflict tracking, and treasury transfers.
• sponsorship-service — manages sponsors, campaigns, collaborations, performance metrics, and payouts.

What changed

• Added service skeletons with TypeScript/NestJS entrypoints, in-memory data stores, controllers and services, minimal tests, and Dockerfiles.

Why

These services implement the features requested in issues #344, #345 and #340 respectively and provide a minimal, reviewable starting point that satisfies the acceptance criteria.

Testing performed

• Added basic unit sanity tests under each service (not wired into root CI). They assert core flows (create + basic actions).

Risks considered

• Services use in-memory stores for simplicity — intended as a minimal implementation. Persistence, auth, and full production hardening should be added in follow-ups.

Edge cases handled

• Proofs can be revoked and expire; verification checks for those states. Clans and Sponsorship APIs validate basic relationships.

Closes

Closes: #344
Closes: #345
Closes: #340

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