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/map/tilemap.cpp

@@ -3,7 +3,6 @@
 #include <algorithm>
 #include <cstddef>
 #include <cstdint>
-#include <iostream>
 #include <stdexcept>
 #include <vector>
 
@@ -12,6 +11,7 @@
 #include "core/resources/resource_cache.hpp"
 #include "core/resources/resource_helper.hpp"
 #include "external/fkyaml_node.hpp"
+#include "utils/log.hpp"
 
 #ifdef _DEBUG
 #include "game/map/tilemap_writer.hpp"
@@ -97,8 +97,7 @@ Tilemap::Tilemap(const std::string& yaml_path) {
         }
     }
 
-    std::cout << "Tilemap: " << cols_ << "x" << rows_ << " tiles ("
-              << width_px_ << "x" << height_px_ << " px) des de " << yaml_path << '\n';
+    Log::info("Tilemap", "{}x{} tiles ({}x{} px) des de {}", cols_, rows_, width_px_, height_px_, yaml_path);
 }
 
 #ifdef _DEBUG