feat: add audit events and runtime state snapshots to database

- Introduced new tables for audit events and runtime state snapshots in the database schema.
- Created data classes for AuditRecord and RuntimeStateRecord to represent the new entities.
- Implemented AuditRepository and RuntimeStateRepository for inserting and retrieving records.
- Enhanced the dashboard to include an audit trail section, displaying recent audit events.
- Added tests for the new audit repository and runtime lifecycle functionalities.
- Updated settings validation to ensure proper configuration for alerting features.
- Integrated alert notifications across various components, including execution sequencer and loss limits.

.env.example

@@ -3,10 +3,31 @@ APP_HOST=0.0.0.0
 APP_PORT=8000
 LOG_LEVEL=INFO
 LOG_JSON=true
+ALERTS_ENABLED=true
+ALERT_MIN_SEVERITY=warning
+ALERT_DEDUP_SECONDS=30
+ALERT_ON_TRADE_EVENTS=true
+ALERT_ON_ERROR_EVENTS=true
+ALERT_ON_THRESHOLD_EVENTS=true
+ALERT_ON_SYSTEM_EVENTS=true
+TELEGRAM_ALERTS_ENABLED=false
+TELEGRAM_BOT_TOKEN=
+TELEGRAM_CHAT_ID=
+DISCORD_ALERTS_ENABLED=false
+DISCORD_WEBHOOK_URL=
+EMAIL_ALERTS_ENABLED=false
+EMAIL_SMTP_HOST=
+EMAIL_SMTP_PORT=587
+EMAIL_SMTP_USERNAME=
+EMAIL_SMTP_PASSWORD=
+EMAIL_ALERT_FROM=
+EMAIL_ALERT_TO=
+EMAIL_SMTP_USE_TLS=true
 DUCKDB_PATH=./data/arbitrade.duckdb
 FERNET_KEY=
 KRAKEN_API_KEY=
 KRAKEN_API_SECRET=
+KRAKEN_API_KEY_PERMISSIONS=query,trade
 KRAKEN_REST_URL=https://api.kraken.com
 KRAKEN_WS_URL=wss://ws.kraken.com/v2
 KRAKEN_PRIVATE_RATE_LIMIT_SECONDS=1.0