Restore PHPBridge.kt API dropped in Jump merge (#111)

[shanerbaner82]

Summary

Fixes the 3.3.0 regression where Android builds fail to compile in apps using the firebase plugin (or any plugin that drives the ephemeral PHP runtime):

PushNotificationService.kt: Unresolved reference 'nativeEphemeralBoot'
PushNotificationService.kt: Unresolved reference 'nativeEphemeralArtisan'
PushNotificationService.kt: Unresolved reference 'nativeEphemeralShutdown'
WebViewManager.kt:          Unresolved reference 'consumePostData'

Five public members existed in PHPBridge.kt as of 866a6dd (the Apr 4 Android POST-body fix) and are still required by current code:

• external fun nativeEphemeralBoot/Artisan/Shutdown — registered as JNI methods in php_bridge.c:1354-1356 and called from plugin code such as nativephp/mobile-firebase's PushNotificationService.
• storePostData(key, data) / consumePostData(key) — used by the bundled WebViewManager.kt (lines 268, 272, 275, 531, 544, 547) to correlate POST bodies stashed by the injected JS XHR/fetch hook with the intercepted request on the native side.

The Jump merge (#111, commit 026a1b7) accidentally dropped these declarations from PHPBridge.kt while leaving the JNI registrations and all callers in place. Restored verbatim from the canonical jump-playground copy that Jump itself runs against, including the 50 ms wait loop on consumePostData that #84 added to handle the race where the WebView fires the network request before the injected JS hook has finished stashing the body — important for concurrent Livewire \$wire bursts to the same endpoint.

Test plan

• Build Android against an app with nativephp/mobile-firebase (or any plugin invoking the ephemeral runtime) — confirm compile succeeds
• Submit a Livewire form post in the running app — confirm POST body reaches Laravel populated (no spurious "field is required" errors)
• Run a few concurrent \$wire calls to the same endpoint — confirm none drop the body (50 ms wait loop covers JS-stash race)
• Confirm Jump's live preview still works against an app on this branch

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