feat: kb_writer 마이크로서비스 + mail_bridge 추가

- kb_writer.py: DEVONthink AppleScript 브릿지 → 마크다운 파일 기반 전환 (포트 8095)
- knowledge-base/ 디렉토리 구조 (note, chat-memory, news)
- Handle Note: kb_writer 파일 저장 + Qdrant 임베딩 추가
- Embed & Save Memory: DEVONthink → kb_writer 교체
- mail_bridge.py: IMAP 날짜 기반 메일 조회 (포트 8094)
- mail-processing-pipeline: IMAP Trigger → Schedule + mail_bridge + dedup
- docker-compose, manage_services, LaunchAgent plist 업데이트

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

com.syn-chat-bot.heic-converter.plist

@@ -6,12 +6,10 @@
     <string>com.syn-chat-bot.heic-converter</string>
     <key>ProgramArguments</key>
     <array>
-        <string>/Users/hyungi/Documents/code/syn-chat-bot/.venv/bin/uvicorn</string>
-        <string>heic_converter:app</string>
-        <string>--host</string>
-        <string>127.0.0.1</string>
-        <string>--port</string>
-        <string>8090</string>
+        <string>/opt/homebrew/opt/python@3.14/bin/python3.14</string>
+        <string>-S</string>
+        <string>-c</string>
+        <string>import sys; sys.path.insert(0,'/Users/hyungi/Documents/code/syn-chat-bot/.venv/lib/python3.14/site-packages'); sys.path.insert(0,'/Users/hyungi/Documents/code/syn-chat-bot'); import uvicorn; uvicorn.run('heic_converter:app',host='127.0.0.1',port=8090)</string>
     </array>
     <key>WorkingDirectory</key>
     <string>/Users/hyungi/Documents/code/syn-chat-bot</string>