Fix AuthConfig references in IsolatedClassLoader for classloader-java v2.0

[sfloess]

Part of #431: Complete SDLC automation and fix classloader-java API compatibility

Problem

IsolatedClassLoader.java references an AuthConfig class that no longer exists in classloader-java v2.0. This causes compilation failures.

Location

• platform-classloader/src/main/java/org/flossware/platform/classloader/IsolatedClassLoader.java (lines 261, 268)

Tasks

• Determine what AuthConfig was replaced with in classloader-java v2.0 API
• Update or remove AuthConfig references in IsolatedClassLoader
• Verify the module compiles against classloader-java v2.0
• Update any related tests

Acceptance Criteria

• platform-classloader module compiles cleanly with classloader-java v2.0
• No references to removed API classes remain