native: perf telemetry, 2 frames in flight, 120 Hz pacing, GPU shadow map

- --perf-log CSV + logcat telemetry (perf_log.h, EterBase/PerfCounters.h),
  incl. display refresh rate / app vsync rate, thermal, CPU clocks;
  tools/pull_perf_logs.sh + tools/perf_summary.py
- Vulkan renderer: two frames in flight, in-frame texture uploads (no
  vkQueueWaitIdle), --fps-cap / --refresh-rate / --frames-in-flight
- Android: ANativeWindow_setFrameRate, ADPF performance hint,
  appCategory=game (ColorOS no longer drops to 60 Hz when idle)
- Character shadow map rendered on the GPU into an offscreen render target
  instead of CPU rasterization + per-frame 1 MB upload; --cpu-shadow keeps
  the old path. Device (120 Hz, 32 mobs): 75 -> ~115 fps, script thread
  8.9 -> 3.4 ms. draw_capture format v10.

Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com>

extension/src/platform/ScriptLib/PythonBoot.cpp

@@ -50,6 +50,7 @@
 #include "../EterBase/LogBox.h"
 #include "../UserInterface/ServerClock.h"
 
+#include <atomic>
 #include <condition_variable>
 #include <cstdlib>
 #include <filesystem>
@@ -61,6 +62,9 @@
 #include <signal.h>
 #include <unistd.h>
 #endif
+#if defined(__linux__) || defined(__ANDROID__)
+#include <unistd.h>
+#endif
 
 namespace
 {
@@ -185,6 +189,7 @@ struct ScriptFiber
 };
 ScriptFiber g_fiber;
 thread_local bool t_on_fiber = false;
+std::atomic<int> g_script_thread_id{0};
 
 // Caller holds the GIL. Returns with the GIL held again after the script has given the baton back.
 void hand_to_script()
@@ -218,6 +223,9 @@ void* fiber_main(void*)
 		g_fiber.cv.wait(lock, [] { return g_fiber.turn == ScriptFiber::Script; });
 	}
 	t_on_fiber = true;
+#if defined(__linux__) || defined(__ANDROID__)
+	g_script_thread_id = int(gettid());
+#endif
 	PyGILState_STATE gil = PyGILState_Ensure();
 	std::string error;
 	const bool ok = run_main_script_body(g_fiber.command_line.c_str(), &error);
@@ -927,6 +935,11 @@ bool RunMainScript(const char* lpCmdLine, std::string* error)
 	return true;
 }
 
+int ScriptThreadId()
+{
+	return g_script_thread_id;
+}
+
 bool IsAppLooping()
 {
 	return g_fiber.alive && g_fiber.looping && !g_fiber.finished;