Bind local DNS before starting proxy

[TurboTheTurtle]

Summary:

• Start LocalDnsWorker before launching ss-local.
• Avoid hostname resolution racing the unix://local_dns_path DNS socket at startup.
• Keep ss-local on the local DNS socket instead of reverting to system DNS.

Why:
ss-local can resolve the remote server hostname immediately after it starts. When the config points DNS at unix://local_dns_path, the Unix socket needs to be bound first; otherwise domain-based profiles can fail during startup with empty resolution results.

Closes #3246.
Refs #3232.
Refs #3223.

Validation:

• git diff --check
• JAVA_HOME=/opt/homebrew/opt/openjdk@21 ANDROID_HOME=/Users/andy/Library/Android/sdk ./gradlew :core:compileDebugKotlin

Please preserve author attribution if this PR is squashed or reworked:
Co-authored-by: Andy Ye 35905412+TurboTheTurtle@users.noreply.github.com