Jetpack charges now take 30s to passively recharge (up from 3s),
making fuel management a core gameplay loop. A new fuel canister
powerup (POWERUP_FUEL) restores exactly one charge on pickup.
The existing jetpack powerup remains as the rare full-refill + 15s
boost. Fuel pickups replace most procedural jetpack spawns at higher
spawn rates to compensate for the weaker per-pickup value. Fuel
canisters also appear in corridors and arenas.
Adds orange canister pixel art, editor icon, entity registry entry,
and places fuel pickups throughout moon01.
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