refactor(wizard): move core to Shared, add IWizardMessenger contract (issue #112)

Moves the game-creation wizard state machine, view builder, and
platform-neutral contracts (callback data, step names, storage
exception, club option, step limits) from GmRelay.Bot to GmRelay.Shared.
Telegram continues to work through a new TelegramWizardMessenger
implementing IWizardMessenger and a WizardInteractionMapper that
converts Update → WizardInteraction. Wires the new platform column on
wizard_drafts (V032 migration) and switches chat/owner/thread/message
ids to TEXT so the same table can hold Discord snowflakes later.

- GameCreationWizard: now in Shared, takes IWizardMessenger +
  IWizardDraftRepository, dispatches on WizardInteraction.
- New IWizardMessenger contract with Edit/Send/Answer/GetOwnerClubs
  (returns string ids so Telegram longs and Discord snowflakes both
  fit).
- New WizardStepViewBuilder in Shared returns
  (text, IReadOnlyList<WizardAction>); TelegramWizardMessenger
  renders actions into InlineKeyboardMarkup via a new Bot-side
  ToInlineKeyboard helper.
- New WizardInteractionMapper in Bot (5-case test) converts Telegram
  Update to WizardInteraction.
- WizardDraft gains a Platform column; ChatId/MessageThreadId/OwnerId/
  DraftMessageId switched to string. V032 migrates existing rows and
  rebuilds the owner lookup index on (platform, owner_id).
- All existing wizard / create-session tests updated to the new
  contract (HandleInteractionAsync + WizardInteraction). Wizard
  callback-data format preserved.
- dotnet build clean, dotnet format --verify-no-changes clean, all
  101 wizard tests pass.

src/GmRelay.Bot/Infrastructure/Telegram/UpdateRouter.cs

@@ -1,4 +1,5 @@
 // ... UpdateRouter will have CancelSessionHandler and cancel_session route instead of close_recruitment
+using System.Globalization;
 using GmRelay.Shared.Domain;
 using GmRelay.Shared.Features.Confirmation.HandleRsvp;
 using GmRelay.Shared.Features.Sessions.CreateSession;
@@ -16,6 +17,7 @@ using Telegram.Bot;
 using Telegram.Bot.Types;
 using Telegram.Bot.Types.Enums;
 using Telegram.Bot.Types.ReplyMarkups;
+using SharedWizard = GmRelay.Shared.Features.Sessions.CreateSession.Wizard.GameCreationWizard;
 
 namespace GmRelay.Bot.Infrastructure.Telegram;
 
@@ -36,7 +38,7 @@ public sealed class UpdateRouter(
     InitiateRescheduleHandler initiateRescheduleHandler,
     BotRescheduleTimeInputHandler rescheduleTimeInputHandler,
     BotRescheduleVoteHandler rescheduleVoteHandler,
-    GameCreationWizard wizard,
+    SharedWizard wizard,
     IWizardDraftRepository drafts,
     ITelegramBotClient bot,
     IConfiguration configuration,
@@ -47,9 +49,9 @@ public sealed class UpdateRouter(
         // 1) Wizard delegation. If the GM has an active (non-expired) draft for this
         //    (chat, thread, owner), every update routes to the wizard. The wizard is
         //    responsible for both text input and callback handling.
-        if (TryGetWizardContext(update, out var chatId, out var threadId, out var ownerId))
+        if (TryGetWizardContext(update, out _, out _, out var ownerId))
         {
-            var draft = await drafts.GetActiveAsync(chatId, threadId, ownerId, ct);
+            var draft = await drafts.GetActiveAsync("Telegram", ownerId, ct);
             if (draft is not null)
             {
                 // Resume / Reset / Cancel menu callbacks live in the router because
@@ -60,7 +62,10 @@ public sealed class UpdateRouter(
                     return;
                 }
 
-                await wizard.HandleUpdateAsync(update, draft, ct);
+                if (WizardInteractionMapper.TryMap(update, out var interaction))
+                {
+                    await wizard.HandleInteractionAsync(interaction, draft, ct);
+                }
 
                 // The "✅ Создать" / "✅ Создать пул" button — the wizard only
                 // acknowledges the callback; the actual session creation lives in
@@ -157,7 +162,7 @@ public sealed class UpdateRouter(
     };
 
     private static WizardPayload LoadPayload(WizardDraft draft) =>
-        GameCreationWizard.LoadPayload(draft);
+        SharedWizard.LoadPayload(draft);
 
     internal static string GetCommandText(Message message)
         => (message.Text ?? message.Caption ?? string.Empty).TrimStart();
@@ -166,30 +171,30 @@ public sealed class UpdateRouter(
     /// Extracts the (chat, thread, owner) triple from an update for wizard lookups.
     /// Returns false for updates that carry no usable origin (e.g. inline queries).
     /// </summary>
-    private static bool TryGetWizardContext(Update update, out long chatId, out int? messageThreadId, out long ownerId)
+    private static bool TryGetWizardContext(Update update, out long chatId, out int? messageThreadId, out string ownerId)
     {
         chatId = 0;
         messageThreadId = null;
-        ownerId = 0;
+        ownerId = string.Empty;
 
         switch (update)
         {
             case { Message: { From: not null, Chat: { } chat } msg }:
                 chatId = chat.Id;
                 messageThreadId = msg.MessageThreadId;
-                ownerId = msg.From!.Id;
+                ownerId = msg.From!.Id.ToString(CultureInfo.InvariantCulture);
                 return true;
 
             case { CallbackQuery: { From: not null, Message: { Chat: { } cbmChat } } cb }:
                 chatId = cbmChat.Id;
                 messageThreadId = cb.Message?.MessageThreadId;
-                ownerId = cb.From!.Id;
+                ownerId = cb.From!.Id.ToString(CultureInfo.InvariantCulture);
                 return true;
 
             case { CallbackQuery: { From: not null } cb2 }:
                 // Callback arrived without a message (e.g. from a Mini App). No chat
                 // context → wizard cannot run on this update.
-                ownerId = cb2.From!.Id;
+                ownerId = cb2.From!.Id.ToString(CultureInfo.InvariantCulture);
                 return false;
 
             default: