Batch 4-b: verify combat on the port route

The fake server spawns a stray dog outside the village's BANPK safe disc
and answers CG_TARGET/CG_ATTACK with GC_TARGET/GC_DAMAGE_INFO/GC_DEAD.
port.login_flow and python_game_render_test hold the left button on it
(MBF_SMART -> __OnPressActor) until it dies. Adds the host/test helper
PythonBoot::Evaluate / Metin2PythonHost.evaluate.

python_3d_surface: emission is now multiplied by the texture, like
D3D's emissive-then-MODULATE, which removes the grey click-glow quad and
the grey wash on characters. Damage numbers wait on CPythonSystem (4-g).

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

extension/src/platform/ScriptLib/PythonBoot.h

@@ -48,6 +48,8 @@ void AppRequestQuit();
 // check uses it to prove the interpreter and the standard library work in-process on a device that has
 // no 40250 packs, which is where RunMainScript cannot run at all.
 bool RunLine(const char* source, std::string* error);
+// str(expression) evaluated in __main__ (a host/test helper; 40250 has no counterpart).
+bool Evaluate(const char* expression, std::string* result, std::string* error);
 
 // Forward physical Godot input to the original 40250 window manager. Coordinates
 // are viewport pixels; SetUISize also establishes its logical resolution.