fix(discord): add missing Dapper.AOT reference to DiscordBot project

GmRelay.Shared references Dapper.AOT with PrivateAssets=all, which
prevents the runtime DLL from flowing to downstream projects. Telegram
bot works because it explicitly references Dapper.AOT directly, but
Discord bot did not — causing FileNotFoundException for Dapper.AOT
at runtime, breaking the scheduler and slash commands.

- Add Dapper.AOT 1.0.48 to GmRelay.DiscordBot.csproj
- Add regression test: DiscordWorkerProject_ShouldExist asserts
  Dapper.AOT is present in the DiscordBot csproj
- Bump version → 3.0.9

Co-Authored-By: Claude Opus 4.7 <noreply@anthropic.com>

.gitea/workflows/deploy.yml

@@ -6,7 +6,7 @@ on:
       - main 
 
 env:
-  VERSION: 3.0.8
+  VERSION: 3.0.9
 
 jobs:
   # ЧАСТЬ 1: Собираем образы и кладем в Gitea (чтобы делиться с ребятами)