feat(qa-lab): Add proxy capture stack and QA Lab inspector (#64895)

* Add proxy capture core and CLI

* Expand transport capture coverage

* Add QA Lab capture backend

* Refine QA Lab capture UI

* Fix proxy capture review feedback

* Fix proxy run cleanup and TTS capture

* Fix proxy capture transport follow-ups

* Fix debug proxy CONNECT target parsing

* Harden QA Lab asset path containment

scripts/lib/plugin-sdk-entrypoints.json

@@ -8,6 +8,7 @@
   "runtime",
   "runtime-doctor",
   "runtime-env",
+  "proxy-capture",
   "runtime-secret-resolution",
   "setup",
   "setup-adapter-runtime",