navigation: add MSP precision landing target consumer for MC/VTOL#11554
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Implement an INAV-side precision-landing target consumer that accepts external target offsets over MSP and applies correction only in MC/VTOL POSHOLD/LAND contexts, without direct motor/attitude control and without mode switching. - add MSP2_INAV_SET_PRECISION_LANDING_TARGET (0x2231 / 8753) - add precision landing state machine module (cache/validate/use/fallback) - integrate with NAV + multicopter position controller + LAND flow - add nav status exposure for precision states (OSD/DJI mappings) - add CLI settings for source/validation/correction/retry behavior - keep descent profile on standard LAND logic (remove custom PL descent tuning) - add retry timeout auto mode: nav_precision_landing_retry_timeout_ms=0 => 2 * lost_hold_time_ms - document MSP payload/reply and navigation behavior in docs Safety behavior: - no activation in fixed-wing profile - no correction use in failsafe - stale/low-confidence/bad-frame targets are rejected - target loss recovery: HOLD -> CLIMB_AND_RETRY -> NORMAL_LAND fallback
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Implement an INAV-side precision-landing target consumer that accepts external target offsets over MSP and applies correction only in MC/VTOL POSHOLD/LAND contexts, without direct motor/attitude control and without mode switching.
Safety behavior: