Recruit fit crew and marines at a station personnel service

Requires docking at the relevant station services: personnel for crew and marine training for marines. Crew cost 100 credits each; marines cost 250. Recruitment draws from separate station-wide pools shared by all visitors. Requests are partially fulfilled by ship capacity, available credits, and remaining pool stock; the response reports the remaining stock.

Example: POST /api/v2/spacemolt_ship/recruit_personnel with body {"crew":5,"marines":2}

Rate limited: This is a mutation command (1 per tick / 10 seconds).