Add Hanabi game

[ICubE01]

Summary

• Adds Hanabi, a new cooperative card game, as a second game alongside Tichu.
• Players can now create a Hanabi room and play a full game: give hints, play cards to build fireworks, and discard to regain clue tokens.
• Supports rule variants (rainbow color mode) and bonus effects (free hint / recover-a-card when a firework is completed).

Backend

Features

• games/common/domain — register Hanabi in GameName, GameBuilder, and GameRuleWrapper so it plugs into the generic game layer.
• games/hanabi/Hanabi — core thread-safe game state: deck, hands, fireworks, clue/fuse tokens, turn flow, scoring, and end conditions.
• games/hanabi/cards — card hierarchy (HanabiCard, HanabiColor, HanabiDeck, HeldCard, Firework) and clue model (Clue, ColorClue, ValueClue).
• games/hanabi/HanabiRule + RainbowMode — configurable rule variants.
• BonusEffect / PendingBonus — free-hint and recover-to-deck/play bonuses triggered on completing a firework.
• HanabiService + HanabiEventHandler — orchestrate game events and broadcasts.
• controllers/ — STOMP handlers: Start, SetRule, Play, Discard, Hint, ResolveBonus, Get (+ HanabiExceptionHandler).
• dtos/, events/, mappers/HanabiMapper — message contracts and domain↔DTO mapping.
• exceptions/ — NotYourTurn, InvalidAction, InvalidHint, NoClueTokens, MaxClueTokens.

Chore

• .claude/docs/hanabi-rules.md — reference rules used for the implementation.

Tests

• HanabiTest, cards/FireworkTest, cards/HanabiDeckTest, cards/HeldCardTest.