v0.3.0b3 - multi AP adapter candidate

Prerelease field-test candidate for Aruba BLE Proxy.\n\nState of the art:\n- Registers each Aruba AP as a distinct Home Assistant Bluetooth adapter source by creating per-AP source entries.\n- Keeps passive BLE advertisement forwarding working through Home Assistant Bluetooth.\n- Keeps experimental active BLE/GATT support enabled by default for field testing.\n- Fixes active notification handling used by SwitchBot lock flows.\n\nKnown limits:\n- Active BLE remains experimental and depends on Aruba firmware behavior.\n- Configuration is still manual: install the custom integration, generate CLI config, paste it into Aruba Instant/AOS.\n\nValidation before release:\n- 160 local tests passing.\n- Sensitive MAC/token grep clean.