feat(ui-cli): add registration and connector columns to station list, fix command...

feat(ui-cli): add registration and connector columns to station list, fix command semantics

Station list improvements:
- Add Registration column (Accepted/Pending/Rejected) after Hash ID
- Add Connectors column with per-connector status letters (1:A 2:O etc.)
- Two-letter abbreviations for ambiguous statuses (Fi/F, SE/SS)
- Remove dead countConnectors function, replace with formatConnectors
- Replace countConnectors tests with formatConnectors tests (7 tests)

Command description semantics:
- All OCPP: 'Send OCPP X' -> 'Request station(s) to send OCPP X'
- Connection: 'Open/Close WebSocket connection' -> '... to CSMS on station(s)'
- Connector: 'Lock/Unlock a connector' -> '... connector on station(s)'
- Transaction: 'Start/Stop a transaction' -> '... on station(s)'
- SKILL.md: 'send OCPP messages' -> 'trigger OCPP messages from stations to the CSMS'
- README: updated accordingly