refactor(log): migra els subsistemes restants i elimina iostream

Acaba la migració dels std::cout/cerr a Log::*:

- core/locale, core/ui/ui_config, core/rendering/{screen,text,gif,
  surface, sprite/animated_sprite, sdl3gpu/*}.
- game/{options, debug_config, editor/editor_config, levels/level_manager,
  map/{map,tilemap,paint_layer}, entities/entity_manager_loadlevel}.

Severitats coherents: warns per a configs absents amb fallback,
errors per a YAML malformat o E/S fallida, infos per a estats.

Resultat:
- 0 occurrences de std::cout/std::cerr a source/.
- Cap #include <iostream> orfà (eliminat de surface.cpp).
- Output funcional idèntic al històric; AEE_LOG filtra (ex.
  `AEE_LOG=warn` només mostra warnings, `AEE_LOG=*:warn,Tag:info`
  combina globals i overrides).

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

source/game/levels/level_manager.cpp

@@ -1,13 +1,13 @@
 #include "game/levels/level_manager.hpp"
 
 #include <algorithm>
-#include <iostream>
 #include <stdexcept>
 #include <utility>
 
 #include "core/resources/resource_helper.hpp"
 #include "external/fkyaml_node.hpp"
 #include "utils/defaults.hpp"
+#include "utils/log.hpp"
 
 namespace Levels {
 
@@ -46,8 +46,7 @@ namespace Levels {
             throw std::runtime_error("LevelManager: la seqüència de " + PATH + " és buida");
         }
         index_ = 0;
-        std::cout << "LevelManager: " << entries_.size() << " sales carregades de "
-                  << PATH << " (començant a " << currentLabel() << ")\n";
+        Log::info("LevelManager", "{} sales carregades de {} (començant a {})", entries_.size(), PATH, currentLabel());
     }
 
     auto LevelManager::currentPath() const -> const std::string& {
@@ -67,22 +66,20 @@ namespace Levels {
     auto LevelManager::advance() -> bool {
         if (index_ + 1 >= count()) { return false; }
         ++index_;
-        std::cout << "LevelManager: avança a " << currentLabel()
-                  << " (" << currentPath() << ")\n";
+        Log::info("LevelManager", "avança a {} ({})", currentLabel(), currentPath());
         return true;
     }
 
     void LevelManager::restart() {
         index_ = 0;
-        std::cout << "LevelManager: restart a " << currentLabel() << '\n';
+        Log::info("LevelManager", "restart a {}", currentLabel());
     }
 
     void LevelManager::setIndex(int new_index) {
         const int CLAMPED = std::clamp(new_index, 0, count() - 1);
         if (CLAMPED != index_) {
             index_ = CLAMPED;
-            std::cout << "LevelManager: setIndex(" << new_index << ") → "
-                      << currentLabel() << " (" << currentPath() << ")\n";
+            Log::info("LevelManager", "setIndex({}) → {} ({})", new_index, currentLabel(), currentPath());
         }
     }
 
@@ -90,14 +87,11 @@ namespace Levels {
         for (std::size_t i = 0; i < entries_.size(); ++i) {
             if (entries_[i].pyramid == pyramid && entries_[i].room == room) {
                 index_ = static_cast<int>(i);
-                std::cout << "LevelManager: starting_point P" << pyramid << "-R" << room
-                          << " trobat a l'índex " << i << " (" << currentPath() << ")\n";
+                Log::info("LevelManager", "starting_point P{}-R{} trobat a l'índex {} ({})", pyramid, room, i, currentPath());
                 return true;
             }
         }
-        std::cerr << "LevelManager: starting_point P" << pyramid << "-R" << room
-                  << " no trobat a levels.yaml — es manté l'índex actual ("
-                  << currentLabel() << ")\n";
+        Log::warn("LevelManager", "starting_point P{}-R{} no trobat a levels.yaml — es manté l'índex actual ({})", pyramid, room, currentLabel());
         return false;
     }