refactor!: strip shaded Adventure (Paper required for Adventure APIs)

[demengc]

Summary

Modernizes Adventure handling and shrinks the shaded JAR by removing the bundled Adventure libraries. Adventure is now declared compileOnly and consumed from the Paper runtime instead.

• Drops shaded adventure-api, adventure-platform-bukkit, and adventure-text-minimessage from the fat JAR; matching relocate(...) rules removed
• Removes BukkitAudiences plumbing from BaseManager and BasePlugin
• Adds BasePlugin#isPaper() backed by a testable detectPaper(Function<String, Class<?>>) predicate (looks for io.papermc.paper.ServerBuildInfo, shipped in Paper since 2024)
• Isolates Adventure usage in Text behind a nested AdventureBridge class with a LinkageError -> UnsupportedOperationException boundary, so loading Text on Spigot does not eagerly trigger NoClassDefFoundError
• Replaces the Text.MINI_MESSAGE static field with a Text.miniMessage() getter
• Swaps BukkitComponentSerializer.legacy() for LegacyComponentSerializer.legacySection() (and casts Player to Audience directly, since Paper's Player implements it)
• Adds happy-path unit tests for the Adventure path (TextAdventureTest) and Paper detection (BasePluginDetectionTest)

⚠️ Breaking change: Adventure APIs now require Paper

Previously, the shaded Adventure libraries meant that Text.parseMini, Text.tellComponent, Text.legacySerialize, Text.miniMessage(), and the "mini:" prefix in Text.tell/tellRaw/tellLocalized/tellLocalizedRaw worked on vanilla Spigot. After this PR they throw UnsupportedOperationException on Spigot (Adventure is not provided by vanilla Spigot at runtime).

Plugins that target both platforms should guard these calls with BasePlugin#isPaper() or catch UnsupportedOperationException. All non-Adventure Text APIs (colorize, legacy & codes, HEX, titles, broadcasts, localization, console output) remain Spigot-compatible.

Documentation has been updated to call this out in README.md, docs/README.md, and docs/core-features/text-and-localization.md. The Text class itself now carries a class-level Javadoc note listing every Paper-only method.

Bundled dependency bumps

This PR also bumps a number of unrelated dependency versions in gradle/libs.versions.toml that were pending: spotless, errorprone-core, nmcp, spigot-api, lombok, xseries, adventure-api, mongodb-driver, jedis, guava. These are not load-bearing for the refactor itself but are bundled here to keep the version catalog moving.

Test plan

• ./gradlew build passes (all modules, including new tests)
• TextAdventureTest exercises the happy path against Adventure on the build host
• BasePluginDetectionTest covers true/false/unrelated-class branches of detectPaper
• Manual smoke on Paper: mini: prefix and tellComponent send styled chat as expected
• Manual smoke on Spigot: non-Adventure Text APIs work; Adventure methods throw UnsupportedOperationException with the documented message