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/ui/hud.cpp

@@ -6,7 +6,6 @@
 #include <cmath>
 #include <cstddef>
 #include <cstdint>
-#include <iostream>
 #include <string>
 #include <utility>
 #include <variant>
@@ -19,6 +18,7 @@
 #include "utils/defaults.hpp"
 #include "utils/defines.hpp"
 #include "utils/easing.hpp"
+#include "utils/log.hpp"
 
 namespace {
 
@@ -127,17 +127,16 @@ Hud::Hud(EventBus& bus, std::shared_ptr<Text> font)
         blk.flash_ms_left = UiConfig::get().hudFlashMs();
         blk.shake_ms_left = UiConfig::get().hudShakeMs();
         blk.shake_intensity = 1.5F;
-        std::cout << "[HUD] player_hit p" << (IDX + 1) << " dmg=" << (dmg != nullptr ? *dmg : 0)
-                  << " lives=" << players_[IDX].lives << '\n';
+        Log::info("HUD", "player_hit p{} dmg={} lives={}", IDX + 1, dmg != nullptr ? *dmg : 0, players_[IDX].lives);
     }));
 
     subs_.push_back(bus_.subscribe("level_complete", [](const Event& /*ev*/) {
         // TODO: capturar `this` i cridar setMode(*, Mode::Win) per als
         // tres blocs quan el mode Win estiga implementat.
-        std::cout << "[HUD] level_complete (mode Win pendent)\n";
+        Log::info("HUD", "level_complete (mode Win pendent)");
     }));
 
-    std::cout << "[HUD] init: 3 blocks ready (entry " << ENTRY_MS << " ms)\n";
+    Log::info("HUD", "init: 3 blocks ready (entry {} ms)", ENTRY_MS);
 }
 
 Hud::~Hud() {