Added

• TeamsAPI guard: optional integration with TeamsAPI that prevents players on the same team from challenging each other. Disabled by default (teams_guard.block_same_team: false). Requires TeamsAPI + a compatible team plugin on the server; if either is absent, the feature is silently skipped (fail-open).
• New TeamsGuardService class in platform-paper — encapsulates the same-team lookup with graceful NoClassDefFoundError handling so the plugin loads cleanly whether or not TeamsAPI is on the classpath.
• TeamsAPI added to softdepend in plugin.yml so Paper loads it before PvPIndex Battles when both plugins are present.
• New config section teams_guard in config.yml.
• New lang keys challenge.same_team and challenge.same_team_target in all bundled language files (en, de, nl, es, pl, zh).
• JitPack repository added to parent pom.xml; teams-api:1.5.0 added as a provided dependency in pvpindex-platform-paper.

Fixed

• Spigot/Paper/Folia compatibility: removed all Adventure API calls that are only available on Paper. The plugin now runs on plain Spigot without NoSuchMethodError crashes.
  • player.sendMessage(Component) → player.sendMessage(String)
  • player.showTitle(Title) → player.sendTitle(String, String, int, int, int)
  • player.playSound(Sound) → player.playSound(Location, org.bukkit.Sound, float, float)
  • Bukkit.createInventory(holder, size, Component) → String overload
  • meta.displayName(Component) / meta.lore(List<Component>) → setDisplayName / setLore
  • ClickEvent / HoverEvent (Adventure) in challenge messages replaced with BungeeCord chat API (player.spigot().sendMessage(...))
• MiniMessage and &-style colour codes are still fully supported for config authors: inputs are parsed internally via MiniMessage/LegacyAmpersand and serialised to §-prefixed legacy strings before being passed to Bukkit APIs.
• Enchantment glint on active GUI tabs now uses item.addUnsafeEnchantment (an ItemStack method, not ItemMeta), fixing a compile error against Paper API 1.21.
• Removed references to GameRule fields that do not exist on older Bukkit versions (FALL_DAMAGE, FIRE_DAMAGE, FREEZE_DAMAGE, DROWNING_DAMAGE).