♻️ 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