feat(admin): users page; document audit-logs, submit endpoint, verification history

[RUKAYAT-CODER]

Small, focused changes.

• Admin users page (FE-61) — add /admin/users listing users with role and verification status (from GET /admin/users), with role-change and suspend/delete actions; admin-only under (protected)/admin. Closes [FE-61] Build /admin/users page #932
• Admin audit-logs (FE-63) — document the audit-logs page: routePath/httpMethod/ipAddress/createdAt columns, userId + date-range filters, admin-only. Closes [FE-63] Build /admin/audit-logs page #934
• POST /submit (CT-31) — document the real anchoring handler (State<AppState>, hash validation, idempotent cache, Stellar anchoring, metrics). Closes [CT-31] Implement real POST /submit handler in the Rust verifier #936
• Verification history (CT-36) — document how history:{hash} is populated and read by GET /verify/:hash/history. Closes [CT-36] Populate verification history — nothing currently writes to the history:{hash} cache key #941

Closes #932
Closes #934
Closes #936
Closes #941

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[mftee]

Reviewed. Two clear contract docs (CT-31 submit endpoint, CT-36 verification history) that accurately describe the existing lib.rs handlers, plus a new admin Users page (FE-61) with a real GET /admin/users fetch, loading/empty states, and route guarded under (protected)/admin per FE-44. Table renders correctly for name/email/role/verification.

One non-blocking note for a follow-up: the 'Change role · Suspend' actions column is currently static text, not wired to the PATCH/DELETE endpoints the docs describe — fine to land now, but worth a fast-follow PR to make those actionable.

Approving.