Show HN: Mediary Scout – Open-source AI agent for cloud drive media tracking

Mediary Scout is an open-source AI agent that acquires media into personal cloud drives (Quark, UC, 115, 123Pan, GuangYaPan, Tianyi) instead of local NAS storage, using a write-scoped sandbox and post-transfer file verification rather than regex rules. It coordinates multiple drives with single-drive priority and cross-drive gap filling, blocks over-quota drives, deduplicates staged files, and can fetch Chinese subtitles from assrt.net. It ships as a signed macOS/Windows desktop app or a Docker Compose stack with a Next.js UI, PostgreSQL, and a bundled PanSou search instance.