♻️ refactor: migrate all remaining bots to shared services

Completed migration of all Matrix bots to @manacore/bot-services:

**SessionService (11 bots migrated):**
- matrix-chat-bot (with conversation/model mapping via setSessionData)
- matrix-contacts-bot
- matrix-skilltree-bot
- matrix-presi-bot
- matrix-questions-bot
- matrix-storage-bot
- matrix-planta-bot
- matrix-manadeck-bot
- matrix-nutriphi-bot (with pendingImage via setSessionData)
- matrix-picture-bot (previous commit)
- matrix-zitare-bot (previous commit)

**TranscriptionService (5 bots migrated):**
- matrix-todo-bot (previous commit)
- matrix-clock-bot (previous commit)
- matrix-zitare-bot (previous commit)
- matrix-nutriphi-bot
- matrix-project-doc-bot

**Code Reduction:**
- Deleted 22 local module files (session + transcription)
- ~1100 lines of duplicate code removed total
- All bots now share identical auth and STT logic

**Special handling:**
- matrix-chat-bot: Extended methods converted to setSessionData/getSessionData
- matrix-nutriphi-bot: pendingImage state via setSessionData
- matrix-project-doc-bot: TranscriptionService used by MediaService

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

services/matrix-skilltree-bot/src/app.module.ts

@@ -3,7 +3,6 @@ import { ConfigModule } from '@nestjs/config';
 import { HealthController } from './health.controller';
 import { BotModule } from './bot/bot.module';
 import { SkilltreeModule } from './skilltree/skilltree.module';
-import { SessionModule } from './session/session.module';
 import configuration from './config/configuration';
 
 @Module({
@@ -14,7 +13,6 @@ import configuration from './config/configuration';
 		}),
 		BotModule,
 		SkilltreeModule,
-		SessionModule,
 	],
 	controllers: [HealthController],
 })