v0.3.0 — Radar Map Manager support (opt-in)

Radar Map Manager support (opt-in)

This release adds compatibility with Moe8383/radar_map_manager.

New option: Settings → Devices & Services → LD2450 BLE → Configure → Radar Map Manager support (off by default).

When enabled:

• the per-target sensor.<device>_target_<n>_x / _y coordinate sensors (mm) are enabled — an empty target slot reports unknown so RMM skips it cleanly;
• a new sensor.<device>_presence_target_count sensor (0–3) is added.

Toggling the option reloads the integration. With the option off, behaviour is unchanged (X/Y disabled by default, no count sensor).

Non-English Home Assistant: RMM matches the literal entity-id suffix _target_<n>_x / _y. HA builds that suffix from the translated entity name (e.g. German _ziel_1_x), so rename the X/Y entity-ids to the target_<n> form for RMM. See the README.

No BLE changes, no renamed/removed entities, no breaking changes. Verified end-to-end on real HLK-LD2450 hardware against a live Radar Map Manager install. 42 tests pass.

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