feat: Desktop wallet, gas estimator UI, and 30-day monitoring stack
Security (Desktop Wallet):
- Implement BIP39 mnemonic generation with cryptographic RNG
- Add Argon2id password-based key derivation (64MB, 3 iterations)
- Add ChaCha20-Poly1305 authenticated encryption for seed storage
- Add mnemonic auto-clear (60s timeout) and clipboard auto-clear (30s)
- Add sanitized error logging to prevent credential leaks
- Strengthen CSP with object-src, base-uri, form-action, frame-ancestors
- Clear sensitive state on component unmount
Explorer (Gas Estimator):
- Add Gas Estimation page with from/to/amount/data inputs
- Add bech32 address validation (synor1/tsynor1 prefix)
- Add BigInt-based amount parsing to avoid floating point errors
- Add production guard for mock mode (cannot enable in prod builds)
Monitoring (30-day Testnet):
- Add Prometheus config with 30-day retention
- Add comprehensive alert rules for node health, consensus, network, mempool
- Add Alertmanager with severity-based routing and inhibition rules
- Add Grafana with auto-provisioned datasource and dashboard
- Add Synor testnet dashboard with uptime SLA tracking
Docker:
- Update docker-compose.testnet.yml with monitoring profile
- Fix node-exporter for macOS Docker Desktop compatibility
- Change Grafana port to 3001 to avoid conflict
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