feat: implement freeze list command and enhance freeze functionality

[Timonso-1]

No description provided.

[MikeyLLP]

Der hat immer eine UUID

[Copilot]

Pull request overview

Implements a new /freezelist command to display currently frozen players, and enhances the freeze system to store richer metadata (who froze whom, when, and until when) to support listing and UI hover details.

Changes:

• Replace the freeze cache value from Long duration to FreezeData (with timestamps + actor metadata) and add query helpers.
• Add and register the /freezelist command with paginated output and an “Entfrieren” action.
• Update /freeze to record the freezing actor, plus README + version bump.

Reviewed changes

Copilot reviewed 6 out of 6 changed files in this pull request and generated 3 comments.

Show a summary per file

File	Description
src/main/kotlin/dev/slne/surf/moderation/tools/service/FreezeService.kt	Stores FreezeData in cache; adds listing/query APIs for freeze metadata.
src/main/kotlin/dev/slne/surf/moderation/tools/PaperCommandManager.kt	Registers the new freezeListCommand().
src/main/kotlin/dev/slne/surf/moderation/tools/commands/FreezeListCommand.kt	New paginated /freezelist command showing freeze metadata and unfreeze action.
src/main/kotlin/dev/slne/surf/moderation/tools/commands/FreezeCommand.kt	Passes frozenBy + frozenByName into FreezeService.freeze().
README.md	Documents /freezelist (needs Markdown fix).
gradle.properties	Bumps snapshot version to 2.1.3-SNAPSHOT.

Comments suppressed due to low confidence (1)

src/main/kotlin/dev/slne/surf/moderation/tools/service/FreezeService.kt:43

• getFrozenPlayers() currently returns the live keys view of the cache’s backing map. Callers can mutate this collection (e.g., remove) and inadvertently modify the cache. Returning a snapshot avoids accidental external mutation.

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