feat(matrix-chat-bot): add Matrix bot for AI chat conversations

- Quick chat mode for stateless single messages (!chat)
- Full conversation management (create, list, select, delete)
- Message history with context-aware AI responses
- Model selection (Ollama, OpenRouter, OpenAI, Anthropic)
- Conversation actions: archive, restore, pin, unpin, rename
- German/English command aliases
- Number-based reference system for ease of use
- JWT auth via mana-core-auth
- Health check endpoint on port 3327

Co-Authored-By: Claude Opus 4.5 <noreply@anthropic.com>

services/matrix-chat-bot/src/bot/bot.module.ts

@@ -0,0 +1,11 @@
+import { Module } from '@nestjs/common';
+import { MatrixService } from './matrix.service';
+import { ChatModule } from '../chat/chat.module';
+import { SessionModule } from '../session/session.module';
+
+@Module({
+	imports: [ChatModule, SessionModule],
+	providers: [MatrixService],
+	exports: [MatrixService],
+})
+export class BotModule {}