PvPIndex Battle

Added

• Configurable after-battle location: players can now be sent to a fixed lobby location or the world spawn after a battle ends, instead of always returning to their pre-battle position. Configured via player_state.after_battle_location in config.yml with three modes: RESTORE (default, existing behaviour), LOBBY (fixed coordinates), or WORLD_SPAWN. Closes #16.
• New AfterBattleLocationSettings config record in platform-paper.
• New config section player_state.after_battle_location with mode, world, x, y, z, yaw, pitch keys.
• PlayerStateService.setAfterBattleLocation() method for runtime override of the post-battle teleport destination.

Changed

• PlayerStateSnapshot.restore() and restoreWithoutInventory() now accept an optional Location override parameter for the teleport destination.
• Upgraded Jackson from 2.18.2 to 2.21.3 and PlaceholderAPI from 2.11.6 to 2.12.2.
• Removed all em dashes from comments, config files, and documentation per coding standards.
• Corrected US English spellings to UK English throughout the codebase.