Add admin panel dashboard and APIs

[gma788-creator]

Closes #28
Closes #29
/claim #28
/claim #29

Summary:

• Replaced the placeholder AdminPanelPage with a functional admin dashboard
• Added admin-only API routes for users, moderation, disputes, controls, and audit logs
• Added tests for admin auth, overview, user status updates, and platform controls

Tests:

• npm run test -w apps/api
• npm run build -w apps/web

[gma788-creator]

Additional validation pass completed after opening this PR:

pm run test -w apps/api passes with the added admin route coverage.

pm run build -w apps/web passes.

• The PR remains scoped to the admin panel issue: admin-only API authorization, dashboard sections, moderation/dispute/control flows, and audit logging.
• Data is intentionally in-memory/mock-backed to match the current repository architecture; the service/controller boundaries are separated so it can be swapped to Prisma persistence later without changing the route contract.

[BossChaos]

Code Review — Bounty #30 ($750)

PR: Add admin panel dashboard and APIs by @gma788-creator

• ✅ Admin panel implementation

Wallet: 0xdaE5d307339074A24F579dB48e7c639359D94904

Code review under Bounty #30 — API Benchmark Suite ($750)