Move blockchain app READMEs to centralized documentation

- Relocate blockchain-event-bridge README content to docs/apps/blockchain/blockchain-event-bridge.md
- Relocate blockchain-explorer README content to docs/apps/blockchain/blockchain-explorer.md
- Replace app READMEs with redirect notices pointing to new documentation location
- Consolidate documentation in central docs/ directory for better organization

docs/apps/infrastructure/monitor.md

@@ -0,0 +1,213 @@
+# Monitor
+
+## Status
+✅ Operational
+
+## Overview
+System monitoring and alerting service for tracking application health, performance metrics, and generating alerts for critical events.
+
+## Architecture
+
+### Core Components
+- **Health Check Service**: Periodic health checks for all services
+- **Metrics Collector**: Collects performance metrics from applications
+- **Alert Manager**: Manages alert rules and notifications
+- **Dashboard**: Web dashboard for monitoring visualization
+- **Log Aggregator**: Aggregates logs from all services
+- **Notification Service**: Sends alerts via email, Slack, etc.
+
+## Quick Start (End Users)
+
+### Prerequisites
+- Python 3.13+
+- Access to application endpoints
+- Notification service credentials (email, Slack webhook)
+
+### Installation
+```bash
+cd /opt/aitbc/apps/monitor
+.venv/bin/pip install -r requirements.txt
+```
+
+### Configuration
+Set environment variables in `.env`:
+```bash
+MONITOR_INTERVAL=60
+ALERT_EMAIL=admin@example.com
+SLACK_WEBHOOK=https://hooks.slack.com/services/...
+PROMETHEUS_URL=http://localhost:9090
+```
+
+### Running the Service
+```bash
+.venv/bin/python main.py
+```
+
+### Access Dashboard
+Open `http://localhost:8080` in a browser to access the monitoring dashboard.
+
+## Developer Guide
+
+### Development Setup
+1. Clone the repository
+2. Create virtual environment: `python -m venv .venv`
+3. Install dependencies: `pip install -r requirements.txt`
+4. Configure monitoring targets
+5. Run tests: `pytest tests/`
+
+### Project Structure
+```
+monitor/
+├── src/
+│   ├── health_check/        # Health check service
+│   ├── metrics_collector/   # Metrics collection
+│   ├── alert_manager/       # Alert management
+│   ├── dashboard/           # Web dashboard
+│   ├── log_aggregator/      # Log aggregation
+│   └── notification/        # Notification service
+├── tests/                   # Test suite
+└── pyproject.toml           # Project configuration
+```
+
+### Testing
+```bash
+# Run all tests
+pytest tests/
+
+# Run health check tests
+pytest tests/test_health_check.py
+
+# Run alert manager tests
+pytest tests/test_alerts.py
+```
+
+## API Reference
+
+### Health Checks
+
+#### Run Health Check
+```http
+GET /api/v1/monitor/health/{service_name}
+```
+
+#### Get All Health Status
+```http
+GET /api/v1/monitor/health
+```
+
+#### Add Health Check Target
+```http
+POST /api/v1/monitor/health/targets
+Content-Type: application/json
+
+{
+  "service_name": "string",
+  "endpoint": "http://localhost:8000/health",
+  "interval": 60,
+  "timeout": 10
+}
+```
+
+### Metrics
+
+#### Get Metrics
+```http
+GET /api/v1/monitor/metrics?service=blockchain-node
+```
+
+#### Query Prometheus
+```http
+POST /api/v1/monitor/metrics/query
+Content-Type: application/json
+
+{
+  "query": "up{job=\"blockchain-node\"}",
+  "range": "1h"
+}
+```
+
+### Alerts
+
+#### Create Alert Rule
+```http
+POST /api/v1/monitor/alerts/rules
+Content-Type: application/json
+
+{
+  "name": "high_cpu_usage",
+  "condition": "cpu_usage > 80",
+  "duration": 300,
+  "severity": "warning|critical",
+  "notification": "email|slack"
+}
+```
+
+#### Get Active Alerts
+```http
+GET /api/v1/monitor/alerts/active
+```
+
+#### Acknowledge Alert
+```http
+POST /api/v1/monitor/alerts/{alert_id}/acknowledge
+```
+
+### Logs
+
+#### Query Logs
+```http
+POST /api/v1/monitor/logs/query
+Content-Type: application/json
+
+{
+  "service": "blockchain-node",
+  "level": "ERROR",
+  "time_range": "1h",
+  "query": "error"
+}
+```
+
+#### Get Log Statistics
+```http
+GET /api/v1/monitor/logs/stats?service=blockchain-node
+```
+
+## Configuration
+
+### Environment Variables
+- `MONITOR_INTERVAL`: Interval for health checks (default: 60s)
+- `ALERT_EMAIL`: Email address for alert notifications
+- `SLACK_WEBHOOK`: Slack webhook for notifications
+- `PROMETHEUS_URL`: Prometheus server URL
+- `LOG_RETENTION_DAYS`: Log retention period (default: 30 days)
+- `ALERT_COOLDOWN`: Alert cooldown period (default: 300s)
+
+### Monitoring Targets
+- **Services**: List of services to monitor
+- **Endpoints**: Health check endpoints for each service
+- **Intervals**: Check intervals for each service
+
+### Alert Rules
+- **CPU Usage**: Alert when CPU usage exceeds threshold
+- **Memory Usage**: Alert when memory usage exceeds threshold
+- **Disk Usage**: Alert when disk usage exceeds threshold
+- **Service Down**: Alert when service is unresponsive
+
+## Troubleshooting
+
+**Health check failing**: Verify service endpoint and network connectivity.
+
+**Alerts not triggering**: Check alert rule configuration and notification settings.
+
+**Metrics not collecting**: Verify Prometheus integration and service metrics endpoints.
+
+**Logs not appearing**: Check log aggregation configuration and service log paths.
+
+## Security Notes
+
+- Secure access to monitoring dashboard
+- Use authentication for API endpoints
+- Encrypt alert notification credentials
+- Implement role-based access control
+- Regularly review alert rules
+- Monitor for unauthorized access attempts