feat: add marketplace metrics, privacy features, and service registry endpoints

- Add Prometheus metrics for marketplace API throughput and error rates with new dashboard panels
- Implement confidential transaction models with encryption support and access control
- Add key management system with registration, rotation, and audit logging
- Create services and registry routers for service discovery and management
- Integrate ZK proof generation for privacy-preserving receipts
- Add metrics instru

docs/user-guide/wallet-management.md

@@ -0,0 +1,65 @@
+---
+title: Wallet Management
+description: Managing your AITBC wallet
+---
+
+# Wallet Management
+
+Your AITBC wallet allows you to store, send, and receive AITBC tokens and interact with the platform.
+
+## Creating a Wallet
+
+### New Wallet
+```bash
+aitbc wallet create
+```
+
+### Import Existing
+```bash
+aitbc wallet import <private_key>
+```
+
+## Wallet Operations
+
+### Check Balance
+```bash
+aitbc wallet balance
+```
+
+### Send Tokens
+```bash
+aitbc wallet send <address> <amount>
+```
+
+### Transaction History
+```bash
+aitbc wallet history
+```
+
+## Security
+
+- Never share your private key
+- Use a hardware wallet for large amounts
+- Enable two-factor authentication
+- Keep backups in secure locations
+
+## Staking
+
+Earn rewards by staking your tokens:
+```bash
+aitbc wallet stake <amount>
+```
+
+## Backup
+
+Always backup your wallet:
+```bash
+aitbc wallet backup --output wallet.backup
+```
+
+## Recovery
+
+Restore from backup:
+```bash
+aitbc wallet restore --input wallet.backup
+```