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/editor/editor_config.cpp

@@ -3,13 +3,13 @@
 #ifdef _DEBUG
 
 #include <cstdint>
-#include <iostream>
 #include <stdexcept>
 #include <string>
 
 #include "core/resources/resource_helper.hpp"
 #include "external/fkyaml_node.hpp"
 #include "utils/defaults.hpp"
+#include "utils/log.hpp"
 
 namespace {
 
@@ -34,7 +34,7 @@ namespace {
             if (!s.empty() && s.front() == '#') { s.erase(0, 1); }
             dst = static_cast<std::uint32_t>(std::stoul(s, nullptr, 0));
         } catch (const std::exception& e) {
-            std::cerr << "EditorConfig: color '" << key << "' invàlid (" << e.what() << ") — ignorat\n";
+            Log::warn("EditorConfig", "color '{}' invàlid ({}) — ignorat", key, e.what());
         }
     }
 
@@ -56,7 +56,7 @@ auto EditorConfig::get() -> EditorConfig& {
 void EditorConfig::load(const std::string& file_path) {
     auto bytes = Resource::Helper::loadFile(file_path);
     if (bytes.empty()) {
-        std::cerr << "EditorConfig: no s'ha pogut obrir " << file_path << " — s'usaran els defaults compilats\n";
+        Log::warn("EditorConfig", "no s'ha pogut obrir {} — s'usaran els defaults compilats", file_path);
         return;
     }
     try {
@@ -76,9 +76,9 @@ void EditorConfig::load(const std::string& file_path) {
             readArgb(c, "picker_hover", picker_hover_argb_);
         }
 
-        std::cout << "EditorConfig: carregat des de " << file_path << '\n';
+        Log::info("EditorConfig", "carregat des de {}", file_path);
     } catch (const std::exception& e) {
-        std::cerr << "EditorConfig: error parsejant " << file_path << ": " << e.what() << '\n';
+        Log::error("EditorConfig", "error parsejant {}: {}", file_path, e.what());
     }
 }