feat(platform-service): add profile updates, tokens, and themes modules
Auth:
- PUT /auth/profile — self-service profile update (displayName, phone, bio, avatarUrl)
- ProfileUpdateSchema added to types.ts
- Repository update() expanded to accept profile fields
Tokens module (new):
- GET /tokens — list tokens (admin: all, user: own)
- POST /tokens — create API token (admin only)
- GET /tokens/count — count active tokens
- PATCH /tokens/:id — revoke token (admin only)
- DELETE /tokens/:id — delete token (super_admin only)
Themes module (new):
- GET /themes — list all themes (admin only)
- POST /themes — create theme (admin only)
- GET /themes/active — get active theme (public, no auth)
- GET /themes/:id — get theme by id (admin only)
- PUT /themes/:id — update theme (admin only)
- DELETE /themes/:id — delete theme (admin only)
- POST /themes/:id/activate — set theme as active (admin only)
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