refactor: move inspector files to api/inspector/

Step 4.2 of source reorganization - move inspector-related files:
- BunInspector.cpp
- InspectorBunFrontendDevServerAgent.cpp/h
- InspectorHTTPServerAgent.cpp/h
- InspectorLifecycleAgent.cpp/h
- InspectorTestReporterAgent.cpp/h

🤖 Generated with [Claude Code](https://claude.com/claude-code)

Co-Authored-By: Claude <noreply@anthropic.com>

cmake/Sources.json

@@ -56,6 +56,7 @@
       "src/buntime/bindings/v8/*.cpp",
       "src/buntime/bindings/v8/shim/*.cpp",
       "src/buntime/api/console/*.cpp",
+      "src/buntime/api/inspector/*.cpp",
       "src/bake/*.cpp",
       "src/deps/*.cpp",
       "src/vm/*.cpp",

cmake/targets/BuildBun.cmake

@@ -866,6 +866,7 @@ target_include_directories(${bun} PRIVATE
   ${CWD}/src/buntime/bindings/sqlite
   ${CWD}/src/buntime/bindings/v8
   ${CWD}/src/buntime/api/console
+  ${CWD}/src/buntime/api/inspector
   ${CWD}/src/buntime/modules
   ${CWD}/src/js/builtins
   ${CWD}/src/napi