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/python_host_node.h

@@ -32,6 +32,7 @@ public:
 	static godot::String run_main_script(const godot::String &command_line);
 	// One line of Python in the same __main__ dictionary. "" when it ran.
 	static godot::String run_line(const godot::String &source);
+	static godot::String evaluate(const godot::String &expression);
 	// True while system.py is inside app.Loop(); ui_update() then runs one CPythonApplication::Process().
 	static bool is_app_looping();
 	static void set_ui_size(int width, int height);