[yiguodev]

Summary

Make the desktop Core's process DNS override optional while preserving the default behavior.

xray run
├─ -set-dns=true (default): require DNS/interface → SetDNS → Core → ResetDNS
└─ -set-dns=false: Core without the libXray resolver override

The disabled mode accepts omitted or unused -dns and -interface values. Configuration remains required, and the English and Chinese CLI documentation describe the boolean flag syntax.

Evidence

• Before: Every desktop run required DNS/interface arguments and installed the process resolver override.
  After: Tests cover default and explicit enablement, disabled mode with omitted or unused DNS arguments, invalid flags, and disabled execution reaching the real configuration parser.
• go test -mod=readonly ./desktop_bin -count=1 -v: passed on Windows amd64.
• python build/main.py windows: succeeded. Both outputs are AMD64; the DLL exports CGoInvoke and CGoFree. Temporary module changes were restored.
• git diff --check: passed. Validation did not start a VPN.

Merge Danger

Door: two-way

Blast Radius: Desktop

Resolver bypass applies only when a caller explicitly supplies -set-dns=false. Live VPN connectivity was not exercised.