mv-ext-search API

Personal email search service. All /api/* endpoints (except /api/health) require the X-Search-Key header.

• GET /api/health
• GET /api/hotmail-search?q=TERM&top=25
• GET /api/hotmail-message?id=...
• GET /api/hotmail-recent?days=5&cap=25
• GET /api/yahoo-search?q=TERM