♻️ refactor: consolidate SessionService & TranscriptionService in @manacore/bot-services

Created shared services to eliminate code duplication across Matrix bots:

**New Services in @manacore/bot-services:**
- SessionService: User authentication via mana-core-auth (was duplicated in 11 bots)
- TranscriptionService: Speech-to-text via mana-stt (was duplicated in 6 bots)

**Migrated Bots:**
- matrix-todo-bot: uses TranscriptionService
- matrix-picture-bot: uses SessionService
- matrix-clock-bot: uses TranscriptionService
- matrix-zitare-bot: uses both SessionService & TranscriptionService

**Code Reduction:**
- Removed ~300 lines of duplicate code from migrated bots
- Centralized service configuration via NestJS modules
- Added comprehensive documentation in CLAUDE.md

Remaining bots can be migrated following the same pattern documented
in packages/bot-services/CLAUDE.md.

Note: @storage/backend type-check fails due to pre-existing drizzle-orm issue

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

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

@@ -1,10 +1,10 @@
 import { Module } from '@nestjs/common';
 import { MatrixService } from './matrix.service';
 import { ClockModule } from '../clock/clock.module';
-import { TranscriptionModule } from '../transcription/transcription.module';
+import { TranscriptionModule } from '@manacore/bot-services';
 
 @Module({
-	imports: [ClockModule, TranscriptionModule],
+	imports: [ClockModule, TranscriptionModule.forRoot()],
 	providers: [MatrixService],
 	exports: [MatrixService],
 })

services/matrix-clock-bot/src/bot/matrix.service.ts

@@ -9,7 +9,7 @@ import {
 import * as path from 'path';
 import * as fs from 'fs';
 import { ClockService, Timer, Alarm } from '../clock/clock.service';
-import { TranscriptionService } from '../transcription/transcription.service';
+import { TranscriptionService } from '@manacore/bot-services';
 import { HELP_TEXT, WELCOME_TEXT } from '../config/configuration';
 
 // Natural language keywords

services/matrix-clock-bot/src/transcription/transcription.module.ts

@@ -1,8 +0,0 @@
-import { Module } from '@nestjs/common';
-import { TranscriptionService } from './transcription.service';
-
-@Module({
-	providers: [TranscriptionService],
-	exports: [TranscriptionService],
-})
-export class TranscriptionModule {}

services/matrix-clock-bot/src/transcription/transcription.service.ts

@@ -1,54 +0,0 @@
-import { Injectable, Logger } from '@nestjs/common';
-import { ConfigService } from '@nestjs/config';
-
-interface SttResponse {
-	text: string;
-	language?: string;
-	model?: string;
-}
-
-@Injectable()
-export class TranscriptionService {
-	private readonly logger = new Logger(TranscriptionService.name);
-	private readonly sttUrl: string;
-
-	constructor(private configService: ConfigService) {
-		this.sttUrl = this.configService.get<string>('stt.url') || 'http://localhost:3020';
-		this.logger.log(`STT Service URL: ${this.sttUrl}`);
-	}
-
-	async transcribe(audioBuffer: Buffer, language: string = 'de'): Promise<string> {
-		const formData = new FormData();
-		const blob = new Blob([new Uint8Array(audioBuffer)], { type: 'audio/ogg' });
-		formData.append('file', blob, 'audio.ogg');
-		formData.append('language', language);
-
-		try {
-			const response = await fetch(`${this.sttUrl}/transcribe`, {
-				method: 'POST',
-				body: formData,
-			});
-
-			if (!response.ok) {
-				const errorText = await response.text();
-				throw new Error(`STT service error: ${response.status} - ${errorText}`);
-			}
-
-			const result: SttResponse = await response.json();
-			this.logger.log(`Transcription completed: ${result.text.substring(0, 50)}...`);
-			return result.text;
-		} catch (error) {
-			this.logger.error('Transcription failed:', error);
-			throw error;
-		}
-	}
-
-	async checkHealth(): Promise<boolean> {
-		try {
-			const response = await fetch(`${this.sttUrl}/health`);
-			return response.ok;
-		} catch {
-			return false;
-		}
-	}
-}