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/core/rendering/sprite/animated_sprite.cpp

@@ -1,12 +1,12 @@
 #include "core/rendering/sprite/animated_sprite.hpp"
 
 #include <cmath>
-#include <iostream>
 #include <numeric>
 #include <utility>
 
 #include "core/rendering/surface.hpp"
 #include "core/resources/resource_cache.hpp"
+#include "utils/log.hpp"
 
 // El parser pure de YAML d'animacions (parseAnimationsFromYaml + helpers)
 // viu a `animated_sprite_parser.cpp` perquè és testable sense Surface ni
@@ -74,10 +74,10 @@ AnimatedSprite::AnimatedSprite(const AnimationResource& cached_data) {
             if (!first.frames.empty()) { setClip(first.frames[0].rect); }
         }
     } catch (const fkyaml::exception& e) {
-        std::cerr << "YAML parsing error in animation " << cached_data.name << ": " << e.what() << '\n';
+        Log::error("AnimatedSprite", "YAML parsing error in animation {}: {}", cached_data.name, e.what());
         throw;
     } catch (const std::exception& e) {
-        std::cerr << "Error loading animation " << cached_data.name << ": " << e.what() << '\n';
+        Log::error("AnimatedSprite", "Error loading animation {}: {}", cached_data.name, e.what());
         throw;
     }
 }
@@ -140,7 +140,7 @@ void AnimatedSprite::setCurrentAnimation(const std::string& name) {
     if (current_animation_ == name) { return; }
     auto it = animations_.find(name);
     if (it == animations_.end()) {
-        std::cout << "** Warning: could not find \"" << name << "\" animation" << '\n';
+        Log::warn("AnimatedSprite", "could not find \"{}\" animation", name);
         return;
     }
     current_animation_ = name;