refactor(#22): разделить SessionBatchRenderer на neutral view и Telegram renderer

- SessionBatchViewBuilder в Shared собирает нейтральную view model
- TelegramSessionBatchRenderer в Bot/Web рендерит HTML + InlineKeyboardMarkup
- DiscordSessionBatchRenderer заглушка подготовлена
- BatchMessageEditor перенесён из Shared в Bot/Web
- Удалён SessionBatchRenderer, убран Telegram.Bot из Shared.csproj
- Обновлены все вызовы (7 handler-ов + Web SessionService + smoke tests)
- Новые тесты на builder и Telegram renderer

src/GmRelay.Web/Services/SessionService.cs

@@ -3,6 +3,7 @@ using GmRelay.Shared.Domain;
 using GmRelay.Shared.Rendering;
 using Npgsql;
 using Telegram.Bot;
+using GmRelay.Web.Services;
 
 namespace GmRelay.Web.Services;
 
@@ -883,7 +884,8 @@ public sealed class SessionService(
 
         await transaction.CommitAsync();
 
-        var renderResult = SessionBatchRenderer.Render(batchTitle, renderedSessions, Array.Empty<ParticipantBatchDto>());
+        var view = SessionBatchViewBuilder.Build(batchTitle, renderedSessions, Array.Empty<ParticipantBatchDto>());
+        var renderResult = TelegramSessionBatchRenderer.Render(view);
         var batchMessage = await bot.SendMessage(
             chatId: chatId,
             messageThreadId: threadId,
@@ -1091,7 +1093,8 @@ public sealed class SessionService(
 
         await transaction.CommitAsync();
 
-        var renderResult = SessionBatchRenderer.Render(template.Title, renderedSessions, Array.Empty<ParticipantBatchDto>());
+        var view = SessionBatchViewBuilder.Build(template.Title, renderedSessions, Array.Empty<ParticipantBatchDto>());
+        var renderResult = TelegramSessionBatchRenderer.Render(view);
         var batchMessage = await bot.SendMessage(
             chatId: group.TelegramChatId,
             text: renderResult.Text,
@@ -1198,7 +1201,8 @@ public sealed class SessionService(
                   ORDER BY sp.registration_status ASC, sp.created_at ASC, sp.responded_at ASC, p.created_at ASC",
                 new { BatchId = batchId })).ToList();
 
-            var renderResult = SessionBatchRenderer.Render(title, sessions, participants);
+            var view = SessionBatchViewBuilder.Build(title, sessions, participants);
+            var renderResult = TelegramSessionBatchRenderer.Render(view);
 
             await BatchMessageEditor.EditBatchMessageAsync(
                 bot,