refactor(log): migra game/scenes i game/ui a Log::

- logo_scene, title_scene, intro_scene, room_fsm: missatges de
  cicle d'escena com a Log::info amb tag "scene" o "RoomFsm".
  Eliminats els TODO obsolets sobre el logger pendent.
- game_scene (16 logs): events del bus (LEVEL COMPLETE, PLAYER HIT,
  PLAYER KILLED) com a info; transicions de ROOM com a info; warns
  als casos d'àudio absent o música no arrencada.
- hud (3 logs): init i events com a info.

Co-Authored-By: Claude Opus 4.7 (1M context) <noreply@anthropic.com>

source/game/scenes/room_fsm.cpp

@@ -1,12 +1,12 @@
 #include "game/scenes/room_fsm.hpp"
 
 #include <array>
-#include <iostream>
 #include <string_view>
 
 #include "core/locale/locale.hpp"
 #include "core/resources/resource_helper.hpp"
 #include "external/fkyaml_node.hpp"
+#include "utils/log.hpp"
 
 namespace {
 
@@ -28,7 +28,7 @@ namespace RoomFsm {
 
         auto bytes = Resource::Helper::loadFile(yaml_path);
         if (bytes.empty()) {
-            std::cout << "RoomFsm: " << yaml_path << " absent — uso fallbacks compilats\n";
+            Log::warn("RoomFsm", "{} absent — uso fallbacks compilats", yaml_path);
             return cfg;
         }
         const auto* begin = reinterpret_cast<const char*>(bytes.data());
@@ -83,9 +83,7 @@ namespace RoomFsm {
             cfg.text_panel_height_px = readChildInt(n, "height_px", cfg.text_panel_height_px);
         }
 
-        std::cout << "RoomFsm: timings carregats des de " << yaml_path
-                  << " (intro fade " << cfg.intro_fade_in_ms
-                  << "ms, outro fade " << cfg.outro_fade_out_ms << "ms)\n";
+        Log::info("RoomFsm", "timings carregats des de {} (intro fade {}ms, outro fade {}ms)", yaml_path, cfg.intro_fade_in_ms, cfg.outro_fade_out_ms);
         return cfg;
     }