Support health-check for single node

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Summary

• Ported the per-proxy health-check capability from ClashMetaForAndroid PR feat: add HealthCheck for specified proxy MetaCubeX/ClashMetaForAndroid#683 into Tabby.
• Added a new per-proxy health-check path through IClashManager → ClashManager → Clash → Bridge (JNI/C) → native Go tunnel.
• Updated Go tunnel connectivity logic to support targeted proxy health checks and non-group fallback URL testing.
• Updated Proxy UI/ViewModel so tapping each proxy delay badge triggers a per-proxy health check and shows pending feedback inline.

Validation

• ./gradlew spotlessApply app:assembleDebug could not run in this environment because Gradle could not resolve com.android.application:9.2.1 from configured repositories.
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Notes

• No PR template was found in this repository, so standard summary/validation sections are provided.

[Copilot]

Pull request overview

Ports per-proxy health-check capability from ClashMetaForAndroid PR MetaCubeX#683 into Tabby, allowing users to tap an individual proxy's delay badge to trigger a targeted health check instead of testing the entire group.

Changes:

• New end-to-end healthCheckProxy(group, name) path: Kotlin UI → IClashManager → ClashManager → Clash → Bridge JNI → Go tunnel.HealthCheckProxy, with a shared probeURL helper that picks a URL from ExtraDelayHistories or defaults to gstatic.com/generate_204.
• Existing tunnel.HealthCheck now falls back to probeURL for non-group proxies instead of just warning.
• ProxyViewModel/ProxyScreen track per-proxy delay-testing state via delayTestingKeys + refreshVersion, render the delay value as a clickable badge with a ··· placeholder while pending, and prune testing keys on reload; the empty-delay fallback also changes from "" to "--".

Reviewed changes

Copilot reviewed 9 out of 9 changed files in this pull request and generated 1 comment.

Show a summary per file

File	Description
ui/proxy/src/main/kotlin/com/github/kr328/clash/proxy/vm/ProxyViewModel.kt	Adds onProxyDelayTest, per-proxy delayTestingKeys state, delayTesting flag on item UI state, and -- fallback for unknown delay.
ui/proxy/src/main/kotlin/com/github/kr328/clash/proxy/ui/ProxyScreen.kt	Wires onProxyDelayTest callback through pager/group/item composables and turns the delay text into a clickable circular badge with pending placeholder.
service/src/main/kotlin/com/github/kr328/clash/service/remote/IClashManager.kt	Adds suspend fun healthCheckProxy(group, name) to the binder interface.
service/src/main/kotlin/com/github/kr328/clash/service/ClashManager.kt	Implements healthCheckProxy by delegating to Clash.healthCheckProxy(...).await().
core/src/main/kotlin/com/github/kr328/clash/core/Clash.kt	Adds healthCheckProxy wrapper around Bridge.nativeHealthCheckProxy.
core/src/main/kotlin/com/github/kr328/clash/core/bridge/Bridge.kt	Declares external fun nativeHealthCheckProxy(...).
core/src/main/cpp/main.c	JNI implementation that forwards (completable, groupName, proxyName) to Go healthCheckProxy; also a whitespace tweak on the existing nativeHealthCheck signature.
core/src/main/golang/native/tunnel.go	Exports healthCheckProxy that runs the check in a goroutine and completes the JNI completable.
core/src/main/golang/native/tunnel/connectivity.go	Adds shared probeURL helper and HealthCheckProxy(groupName, proxyName); non-group HealthCheck now also calls probeURL.

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