Hook registry: list installed hooks + call counts in Injection panel

Add a process-wide hook registry (hook/src/hook_registry) that every hook
module registers its hooks with and bumps a counter from each detour. The
XInput, focus-spoof, and audio render-hooks now register their individual
hooks (XInputGetState/Ex/Caps/SetState; GetForegroundWindow/GetActiveWindow/
GetFocus/WndProc guard; IMMDevice::Activate, IAudioClient::Initialize/
GetService, IAudioRenderClient::GetBuffer/ReleaseBuffer) and count calls.

The worker publishes the table to the host each tick over a new HookStatus
field (protocol v4 -> v5: HookEntry[] + count). The Injection panel shows it
as a collapsible table grouped by subsystem with an installed flag and call
count per hook; coop_audio_probe prints the same table headless.

Verified against Phantom Brave: 13 hooks listed with live counts (focus APIs
polled heavily, GetBuffer/ReleaseBuffer ticking with the audio render loop).
All four tests pass.

Co-Authored-By: Claude Opus 4.8 <noreply@anthropic.com>

tests/CMakeLists.txt

@@ -2,7 +2,8 @@
 # Reuses the hook's xinput_hook.cpp directly so it exercises the shipping code.
 add_executable(hook_selftest
 	hook_selftest.cpp
-	${CMAKE_SOURCE_DIR}/hook/src/xinput_hook.cpp)
+	${CMAKE_SOURCE_DIR}/hook/src/xinput_hook.cpp
+	${CMAKE_SOURCE_DIR}/hook/src/hook_registry.cpp)
 
 target_include_directories(hook_selftest PRIVATE ${CMAKE_SOURCE_DIR}/hook/src)
 
@@ -42,7 +43,8 @@ add_test(NAME audio_loopback_test COMMAND audio_loopback_test)
 add_executable(audio_hook_test
 	audio_hook_test.cpp
 	${CMAKE_SOURCE_DIR}/hook/src/audio_hook.cpp
-	${CMAKE_SOURCE_DIR}/hook/src/debug_log.cpp)
+	${CMAKE_SOURCE_DIR}/hook/src/debug_log.cpp
+	${CMAKE_SOURCE_DIR}/hook/src/hook_registry.cpp)
 
 target_include_directories(audio_hook_test PRIVATE ${CMAKE_SOURCE_DIR}/hook/src)