Streaker

• Upgrade dependencies: HikariCP 7.1.0, Caffeine 3.2.4, sqlite-jdbc 3.53.2.0, mariadb 3.5.9, slf4j 2.0.18, JUnit BOM 6.1.1, Shadow Plugin 9.3.0
• Fix Folia incompatibility in MenuService: replace BukkitScheduler.runTaskTimer with PlatformAdapter.scheduleRepeating() (GlobalRegionScheduler on Folia)
• Fix StreakMenuHolder: remove BukkitTask dependency, use AtomicBoolean cancel flag
• Add PlatformAdapter.scheduleRepeating() returning Runnable cancellation handle
• Add HikariCP relocation in shadow JAR to prevent conflicts
• Update plugin.yml with compatibility range comment (1.21.1 through 26.2)
• Update README badges to show 1.21.1+ through 26.2 support
• Update CHANGELOG with v2.2.0 entry

Platform support: Paper 1.21.1+ / Folia 1.21.1+ / Paper 26.1.x / Paper 26.2 Java: 21 | api-version: 1.21 (maximum backward compatibility)