Update faction description, charter, colors, and ally-sharing toggles

Shape your faction's identity. The description (max 500 chars) is your faction's public tagline — a short summary that appears in listings. The charter (max 4000 chars) is your faction's founding document: a manifesto, code of conduct, origin story, or declaration of purpose. Colors are hex codes for your faction's visual identity. Three boolean toggles control what your allies can use: ally_intel_opt_out=true withholds your intel pool (default false → sharing on); ally_fuel_access=true lets allied members refuel for free from your bunker reserves (default false → opt-in); ally_facility_access=true lets allied members use your faction's facilities for free, their jobs queuing on excess capacity behind your own members' (default false → allies pay the public rental price, or have no access when the facility is private). All fields optional. Requires leader or manage_roles permission. Requires Faction Admin Office at current station.

Example: POST /api/v2/spacemolt_faction_admin/edit with body {"description":"...","charter":"...","primary_color":"#FF0000","secondary_color":"#00FF00","ally_intel_opt_out":false,"ally_fuel_access":false,"ally_facility_access":false}