Phase 5-6: API usage tracking + Calendar/Mail/DEVONthink/OmniFocus/News pipeline

- 파이프라인 42→51노드 확장 (calendar/mail/note 핸들러 추가)
- 네이티브 서비스 6개: heic_converter(:8090), chat_bridge(:8091),
  caldav_bridge(:8092), devonthink_bridge(:8093), inbox_processor, news_digest
- 분류기 v2→v3: calendar, reminder, mail, note intent 추가
- Mail Processing Pipeline (7노드, IMAP 폴링)
- LaunchAgent plist 6개 + manage_services.sh
- migrate-v3.sql: news_digest_log + calendar_events 확장
- 개발 문서 현행화 (CLAUDE.md, QUICK_REFERENCE.md, docs/architecture.md)

Co-Authored-By: Claude Opus 4.6 <noreply@anthropic.com>

init/migrate-v3.sql

@@ -0,0 +1,39 @@
+-- migrate-v3.sql: Phase 6 확장 — 캘린더/메일/뉴스 마이그레이션
+-- 실행: docker exec -i bot-postgres psql -U bot -d chatbot < init/migrate-v3.sql
+
+-- ========================
+-- 캘린더 확장
+-- ========================
+
+ALTER TABLE calendar_events ADD COLUMN IF NOT EXISTS caldav_uid VARCHAR(200);
+ALTER TABLE calendar_events ADD COLUMN IF NOT EXISTS description TEXT;
+ALTER TABLE calendar_events ADD COLUMN IF NOT EXISTS created_by VARCHAR(100);
+
+CREATE INDEX IF NOT EXISTS idx_cal_start ON calendar_events(start_time);
+CREATE INDEX IF NOT EXISTS idx_cal_caldav_uid ON calendar_events(caldav_uid);
+CREATE INDEX IF NOT EXISTS idx_cal_created_by ON calendar_events(created_by);
+
+-- ========================
+-- 메일 인덱스 (Stage C용)
+-- ========================
+
+CREATE INDEX IF NOT EXISTS idx_mail_date ON mail_logs(mail_date);
+CREATE INDEX IF NOT EXISTS idx_mail_label ON mail_logs(label);
+CREATE INDEX IF NOT EXISTS idx_mail_account ON mail_logs(account_id);
+
+-- ========================
+-- 뉴스 다이제스트 로그 (Stage E용)
+-- ========================
+
+CREATE TABLE IF NOT EXISTS news_digest_log (
+    id SERIAL PRIMARY KEY,
+    article_url TEXT UNIQUE,
+    source VARCHAR(50),
+    original_lang VARCHAR(10),
+    title_ko TEXT,
+    summary_ko TEXT,
+    processed_at TIMESTAMPTZ DEFAULT NOW(),
+    qdrant_id VARCHAR(100),
+    devonthink_uuid VARCHAR(100)
+);
+CREATE INDEX IF NOT EXISTS idx_news_processed ON news_digest_log(processed_at);