Add USB storage device control feature

- Add USB policy fields to machines schema (policy, status, error)
- Create usbPolicyEvents table for audit logging
- Implement Convex mutations/queries for USB policy management
- Add REST API endpoints for desktop agent communication
- Create Rust usb_control module for Windows registry manipulation
- Integrate USB policy check in agent heartbeat loop
- Add USB policy control component in admin device overview
- Add localhost:3001 to auth trustedOrigins for dev

🤖 Generated with [Claude Code](https://claude.com/claude-code)

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

apps/desktop/src-tauri/Cargo.toml

@@ -36,3 +36,6 @@ parking_lot = "0.12"
 hostname = "0.4"
 base64 = "0.22"
 sha2 = "0.10"
+
+[target.'cfg(windows)'.dependencies]
+winreg = "0.55"