feat(WHE-27): add drizzle db package and typed env config

.env.example

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+# Core
+NODE_ENV=development
+LOG_LEVEL=info
+APP_URL=http://localhost:3000
+
+# Database / Supabase
+DATABASE_URL=postgres://postgres:postgres@127.0.0.1:54322/postgres
+SUPABASE_URL=https://your-project-ref.supabase.co
+SUPABASE_PUBLISHABLE_KEY=your-supabase-publishable-key
+SUPABASE_SERVICE_ROLE_KEY=your-supabase-service-role-key
+
+# Telegram
+TELEGRAM_BOT_TOKEN=your-telegram-bot-token
+TELEGRAM_WEBHOOK_SECRET=your-webhook-secret
+TELEGRAM_BOT_USERNAME=your_bot_username
+
+# Parsing / AI
+OPENAI_API_KEY=your-openai-api-key
+PARSER_MODEL=gpt-4.1-mini
+
+# Monitoring
+SENTRY_DSN=
+
+# GCP
+GCP_PROJECT_ID=your-gcp-project-id
+GCP_REGION=europe-west1
+CLOUD_RUN_SERVICE_BOT=household-bot
+
+# Scheduler
+SCHEDULER_SHARED_SECRET=your-scheduler-shared-secret