#44 [Admin Panel] Token Management API - Generate Token

Implement POST /api/v1/admin/tokens endpoint to generate JWT tokens for users. **API Specification:** - Endpoint: POST /api/v1/admin/tokens - Permission Required: manage_users - Request Body: {user_id, expires_in_hours?, description?, scopes[]?} - Response: {token_id, token, expires_at, user_id, description} **Requirements:** - Generate JWT with configurable expiration (default: 24h, max: 8760h/1year) - Optional token description for identification - Optional scope limitation (subset of user's permissions) - Store token metadata in database for tracking - Log audit event for token generation **Token Tracking Table:** - token_id (UUID), user_id, tenant_id - token_hash (SHA256 of token for lookup) - description, scopes[] - created_at, expires_at, last_used_at - created_by, is_revoked **Use Cases:** - Service accounts - Long-lived API access - Temporary elevated access **IMPORTANT:** Implement with ultra attention to details and correctness. **BEFORE CLOSING:** Take screenshot showing token generation. Add comment summarizing implementation.