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/tests/port_login_flow_server.cpp

@@ -22,7 +22,17 @@ namespace
 {
 constexpr std::uint32_t kHandshake = 0x2468ace0;
 constexpr int kHandshakeRetryLimit = 32; // game/src/desc.h HANDSHAKE_RETRY_LIMIT
-constexpr int kIdleMs = 20000;
+// A client that sends nothing for this long is dropped. MT_FAKE_IDLE_MS raises it for runs that stand
+// still in game (perf measurements).
+int idle_ms()
+{
+	static const int ms = [] {
+		const char* value = std::getenv("MT_FAKE_IDLE_MS");
+		const long parsed = value && *value ? std::strtol(value, nullptr, 10) : 0;
+		return parsed >= 1000 ? static_cast<int>(parsed) : 20000;
+	}();
+	return ms;
+}
 
 int fake_mob_count()
 {
@@ -127,7 +137,7 @@ struct FakeLoginServer::Connection
 			int ready = poll(&pfd, 1, 50);
 			if (ready == 0)
 			{
-				if ((waited += 50) >= kIdleMs)
+				if ((waited += 50) >= idle_ms())
 					return -1;
 				continue;
 			}
@@ -222,7 +232,7 @@ bool FakeLoginServer::Accept(int listener, Connection& c)
 			c.fd = accept(listener, nullptr, nullptr);
 			return c.fd >= 0;
 		}
-		if (waited >= kIdleMs)
+		if (waited >= idle_ms())
 			return Fail("no client connected");
 	}
 	return false;