BetterPets-Paper

Fixes

• /pets give now tab-completes variant skins — after the pet (and level/player), the command suggests that pet's variants, so you can see and pick a specific skin to give.
• Pet name aliases — pets can now be given by alternate names. Added German aliases for the new pets, e.g. schutzengel → Guardian Angel, greif → Griffin, plus skorpion, gottesanbeterin, loewe, hoehlenspinne, schneegolem, arkanerfuchs, mechaniker, krake, waschbaer. (The English id/name still works too — e.g. /pets give guardian_angel.)

Compiles clean on Paper 26.2; 66/66 tests pass.