Fix minor issues and add wallet funding documentation

Changes:
- Fix certificate viewing display issue in master_training_launcher.sh
  - Use array to store certificate files for reliable iteration
  - Add error handling for read command
  - Ensure CERT_DIR exists before checking for certificates
  - Fix certificate selection using array index instead of head/tail

- Add wallet funding script (scripts/training/fund_wallet.sh)
  - Fund wallets from genesis using genesis password
  - Reads password from /var/lib/aitbc/keystore/.genesis_password
  - Verifies genesis balance before funding
  - Shows transaction hash and wallet balance after funding

- Add wallet funding documentation (docs/agent-training/WALLET_FUNDING.md)
  - Genesis wallet details and password location
  - Quick funding script usage
  - Manual funding with AITBC CLI
  - Faucet service information
  - Common training wallets
  - Troubleshooting guide
  - Security notes

docs/agent-training/WALLET_FUNDING.md

@@ -0,0 +1,153 @@
+# Wallet Funding Guide
+
+This guide explains how to fund wallets for AITBC training and testing.
+
+## Genesis Wallet
+
+The genesis wallet is pre-funded with 997,999,290 AIT and serves as the primary funding source for training wallets.
+
+**Genesis Wallet Details:**
+- Name: `genesis`
+- Address: `ait175406af70445617b0cd7eb8ff384d81b15c26b45`
+- Balance: 997,999,290 AIT
+- Password file: `/var/lib/aitbc/keystore/.genesis_password`
+
+## Quick Funding Script
+
+Use the provided script to fund wallets from genesis:
+
+```bash
+./scripts/training/fund_wallet.sh <wallet_name> [amount]
+```
+
+**Examples:**
+```bash
+# Fund hermes-trainee with default amount (1000 AIT)
+./scripts/training/fund_wallet.sh hermes-trainee
+
+# Fund a specific wallet with custom amount
+./scripts/training/fund_wallet.sh training-wallet 5000
+```
+
+## Manual Funding
+
+To manually fund a wallet using the AITBC CLI:
+
+```bash
+# Read genesis password
+GENESIS_PASSWORD=$(cat /var/lib/aitbc/keystore/.genesis_password)
+
+# Send funds from genesis to target wallet
+./aitbc-cli wallet send genesis <target_wallet> <amount> "$GENESIS_PASSWORD"
+```
+
+**Example:**
+```bash
+./aitbc-cli wallet send genesis hermes-trainee 100 "EzE4d8cLJo20E9FlquSXq7hqy-e6p4M7Q1ZkM5eLpmY"
+```
+
+## Checking Wallet Balances
+
+```bash
+# Check specific wallet balance
+./aitbc-cli wallet balance <wallet_name>
+
+# List all wallets
+./aitbc-cli wallet list
+```
+
+## Faucet Service
+
+The AITBC system includes a faucet service for automated wallet funding.
+
+### Faucet Setup (Deprecated)
+
+The bash-based faucet setup script is deprecated. Use the Python-based setup system instead:
+
+```bash
+python3 -m aitbc.training_setup.cli setup
+```
+
+This will:
+1. Check prerequisites
+2. Setup genesis wallet as funding source
+3. Fund training wallets
+4. Configure messaging authentication
+
+### Faucet API
+
+If the faucet service is running, you can fund wallets via HTTP API:
+
+```bash
+curl -X POST http://localhost:8080/fund \
+  -H "Content-Type: application/json" \
+  -d '{"address": "ait1..."}'
+```
+
+**Default faucet configuration:**
+- Port: 8080
+- Funding amount: 1000 AIT per request
+- Rate limit: 10 requests per hour per IP
+
+## Common Training Wallets
+
+**Default training wallets:**
+- `hermes-trainee` - Primary training wallet
+- `training-wallet` - General training operations
+- `exam-wallet` - Exam and testing
+- `faucet` - Faucet service wallet (if configured)
+
+**Test wallets:**
+- `test-agent` - Agent testing
+- `scenario_user` - Scenario testing
+- `openclaw-trainee` - OpenClaw training
+
+## Troubleshooting
+
+### Genesis Password Not Found
+
+If the genesis password file is missing or empty:
+
+```bash
+# Check if file exists
+ls -la /var/lib/aitbc/keystore/.genesis_password
+
+# If missing, the genesis wallet may need to be reconfigured
+# Contact your system administrator
+```
+
+### Insufficient Genesis Balance
+
+If the genesis wallet has insufficient funds:
+
+```bash
+# Check genesis balance
+./aitbc-cli wallet balance genesis
+
+# If balance is low, you may need to mine new blocks
+# or regenerate the genesis block
+```
+
+### Transaction Failed
+
+If funding transactions fail:
+
+1. Verify the target wallet exists
+2. Check blockchain node status
+3. Ensure services are running:
+   ```bash
+   systemctl status aitbc-blockchain-node.service
+   ```
+
+## Security Notes
+
+- The genesis password is stored in `/var/lib/aitbc/keystore/.genesis_password` with 0600 permissions
+- Never share the genesis password
+- Backup the genesis wallet file and password
+- For production, consider using a separate faucet wallet instead of genesis
+
+## Related Documentation
+
+- [Training Environment Setup](ENVIRONMENT_SETUP.md)
+- [Genesis Generation](/opt/aitbc/docs/infrastructure/genesis_generation.md)
+- [Training Playground](/opt/aitbc/scripts/training/README.md)