feat: persist authenticated accounts and reconnectable game memberships

[Enn3Developer]

No description provided.

[claude]

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Summary

Adds persistent player accounts (register/login/session tokens) and makes lobby and game membership durable across reconnects, backed by server-side SQLite persistence so lobbies, sessions and completed games survive a restart.

Changes

• Server: New GameServer.Accounts.cs/ServerStore additions for registration, login, PBKDF2 password hashing, and 30-day session tokens with per-connection auth throttling; lobby/game membership now keyed by persistent account id instead of transport connection id.
• Server: New GameServer.Persistence.cs and ServerStore.Archive.cs capture and restore full server state (lobbies, in-progress games, account renames) transactionally, only replying after a successful SQLite commit, with rollback on failure; completed games are archived instead of discarded.
• Server: GameManager/GameSession/LobbyManager reworked to support disconnect/reconnect (Join/Disconnect/FindByAccount) without losing a seat, plus a new README.md documenting deployment and the account/session protocol.
• Client: NetworkNode gains Register/Login/Logout/session-resume flow with local token storage, and new MyGames/game-membership packets (JoinGamePacket, LeaveGamePacket, ResignGamePacket).
• Client: Lobby.cs/Game.cs updated for login/registration UI and reconnect-aware game state handling.
• Tests: New integration/unit tests for authentication flow, completed-game archiving, persistence failure/rollback, and server transactions.

Worth a look

• Protocol version bump and new packets are a breaking wire-format change for existing clients/servers.
• WithStateAsync now wraps every inbound packet (including read-only ones) and serializes full server state to diff against the previous snapshot — worth checking the cost as games/accounts grow.
• Turn-timer mode (TimerMode on lobbies, GameClockPacket) is added to the wire protocol and UI but has no server-side effect yet.