♻️ refactor(matrix-bots): remove offline mode, require login for all operations

- Remove local JSON storage from matrix-todo-bot and matrix-calendar-bot
- Delete TodoService, CalendarService and their modules
- Add requireLogin() helper that prompts users to authenticate
- All bot commands now require login before any operation
- Data is always synced with respective backends (todo-backend, calendar-backend)
- Update CLAUDE.md documentation for both bots

BREAKING CHANGE: Bots no longer work without authentication

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

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

@@ -1,7 +1,6 @@
 import { Module } from '@nestjs/common';
 import { ConfigModule, ConfigService } from '@nestjs/config';
 import { MatrixService } from './matrix.service';
-import { CalendarModule } from '../calendar/calendar.module';
 import {
 	TranscriptionModule,
 	SessionModule,
@@ -23,7 +22,6 @@ const calendarApiServiceProvider = {
 @Module({
 	imports: [
 		ConfigModule,
-		CalendarModule,
 		TranscriptionModule.register({
 			sttUrl: process.env.STT_URL || 'http://localhost:3020',
 		}),