feat: refactor Todoist integration to single app with OAuth

- Single webhook URL for all users

- OAuth authorization flow

- Removed individual webhook tokens

- User identification by todoist_user_id

- Added OAuth endpoints: connect, callback, status, disconnect

- Updated frontend with OAuth flow

- DB migration 013: removed webhook_token, added todoist_user_id, todoist_email, access_token

Version: 2.2.0

play-life-backend/migrations/013_refactor_todoist_single_app.sql

@@ -0,0 +1,45 @@
+-- Migration: Refactor todoist_integrations for single Todoist app
+-- Webhook теперь единый для всего приложения, токены в URL больше не нужны
+-- Все пользователи используют одно Todoist приложение
+
+-- ============================================
+-- 1. Добавляем новые поля
+-- ============================================
+ALTER TABLE todoist_integrations 
+ADD COLUMN IF NOT EXISTS todoist_user_id BIGINT;
+
+ALTER TABLE todoist_integrations 
+ADD COLUMN IF NOT EXISTS todoist_email VARCHAR(255);
+
+ALTER TABLE todoist_integrations 
+ADD COLUMN IF NOT EXISTS access_token TEXT;
+
+-- ============================================
+-- 2. Удаляем webhook_token (больше не нужен!)
+-- ============================================
+ALTER TABLE todoist_integrations 
+DROP COLUMN IF EXISTS webhook_token;
+
+-- ============================================
+-- 3. Удаляем старый индекс на webhook_token
+-- ============================================
+DROP INDEX IF EXISTS idx_todoist_integrations_webhook_token;
+
+-- ============================================
+-- 4. Создаем новые индексы
+-- ============================================
+CREATE UNIQUE INDEX IF NOT EXISTS idx_todoist_integrations_todoist_user_id 
+ON todoist_integrations(todoist_user_id) 
+WHERE todoist_user_id IS NOT NULL;
+
+CREATE UNIQUE INDEX IF NOT EXISTS idx_todoist_integrations_todoist_email 
+ON todoist_integrations(todoist_email) 
+WHERE todoist_email IS NOT NULL;
+
+-- ============================================
+-- 5. Комментарии
+-- ============================================
+COMMENT ON COLUMN todoist_integrations.todoist_user_id IS 'Todoist user ID (from OAuth) - used to identify user in webhooks';
+COMMENT ON COLUMN todoist_integrations.todoist_email IS 'Todoist user email (from OAuth)';
+COMMENT ON COLUMN todoist_integrations.access_token IS 'Todoist OAuth access token (permanent)';
+