docs: define independent auto-insert architecture

Ariver

2026-07-13 490d60bbc90a4f407d2d9111e0da70e7efe6995a

 C1.source/privatevoice.src/internal/hotkey/hotkey.go

@@ -13,6 +13,8 @@
   IsAnyOtherKeyPressed(excludeVK int) bool
   // IsAnyOtherKeyPressedSince returns true if another key was pressed after since.
   IsAnyOtherKeyPressedSince(excludeVK int, since time.Time) bool
   // Close releases listener resources.
   Close()
}

// New creates a new platform-specific hotkey listener.