refactor(log): migra core/resources i core/system a Log::

- resource_pack.cpp i resource_cache.cpp: tots els std::cerr passen a
  Log::error.
- director.cpp: std::cout/cerr/fprintf → Log::info / error / critical
  segons severitat.
- printWithDots (utils.cpp): ara és un wrapper sobre Log::info que
  manté l'amplada total (~50 chars) reproduint l'alineació de punts.
  Els callers pasen el tag sense " : " (ja l'afegeix el logger).
- pack_resources: afegit log.cpp i SDL3 al target perquè
  resource_pack.cpp ara depèn de Log::.

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

source/core/resources/resource_cache.cpp

@@ -1,12 +1,12 @@
 #include "core/resources/resource_cache.hpp"
 
 #include <algorithm>
-#include <iostream>
 #include <stdexcept>
 
 #include "core/audio/jail_audio.hpp"
 #include "core/resources/palette_loader.hpp"
 #include "core/resources/resource_helper.hpp"
+#include "utils/log.hpp"
 #include "utils/utils.hpp"
 
 // Deleters dels recursos d'àudio: necessiten veure el tipus complet de
@@ -37,19 +37,19 @@ namespace Resource {
             throw std::runtime_error("Cache: cannot load animation " + file_path);
         }
         animations_.emplace_back(AnimationResource{.name = name, .yaml_data = std::move(bytes)});
-        printWithDots("Animation : ", getFileName(file_path), "[ LOADED ]");
+        printWithDots("Animation", getFileName(file_path), "[ LOADED ]");
     }
 
     void Cache::loadPalette(const std::string& name, const std::string& file_path) {
         auto palette = PaletteLoader::loadFromFile(file_path);
         palettes_.emplace_back(PaletteResource{.name = name, .palette = palette});
-        printWithDots("Palette : ", getFileName(file_path), "[ LOADED ]");
+        printWithDots("Palette", getFileName(file_path), "[ LOADED ]");
     }
 
     auto Cache::getSurface(const std::string& name) -> std::shared_ptr<Surface> {
         auto it = std::ranges::find_if(surfaces_, [&name](const auto& s) { return s.name == name; });
         if (it == surfaces_.end()) {
-            std::cerr << "Cache: surface not found: " << name << '\n';
+            Log::error("Cache", "surface not found: {}", name);
             throw std::runtime_error("Surface not found: " + name);
         }
         return it->surface;
@@ -58,7 +58,7 @@ namespace Resource {
     auto Cache::getAnimationData(const std::string& name) -> const AnimationResource& {
         auto it = std::ranges::find_if(animations_, [&name](const auto& a) { return a.name == name; });
         if (it == animations_.end()) {
-            std::cerr << "Cache: animation not found: " << name << '\n';
+            Log::error("Cache", "animation not found: {}", name);
             throw std::runtime_error("Animation not found: " + name);
         }
         return *it;
@@ -67,7 +67,7 @@ namespace Resource {
     auto Cache::getPalette(const std::string& name) -> const Palette& {
         auto it = std::ranges::find_if(palettes_, [&name](const auto& p) { return p.name == name; });
         if (it == palettes_.end()) {
-            std::cerr << "Cache: palette not found: " << name << '\n';
+            Log::error("Cache", "palette not found: {}", name);
             throw std::runtime_error("Palette not found: " + name);
         }
         return it->palette;
@@ -83,7 +83,7 @@ namespace Resource {
             throw std::runtime_error("Cache: Ja::loadMusic failed for " + file_path);
         }
         musics_.emplace_back(MusicResource{.name = name, .music = std::unique_ptr<Ja::Music, MusicDeleter>(raw)});
-        printWithDots("Music : ", getFileName(file_path), "[ LOADED ]");
+        printWithDots("Music", getFileName(file_path), "[ LOADED ]");
     }
 
     void Cache::loadSound(const std::string& name, const std::string& file_path) {
@@ -96,13 +96,13 @@ namespace Resource {
             throw std::runtime_error("Cache: Ja::loadSound failed for " + file_path);
         }
         sounds_.emplace_back(SoundResource{.name = name, .sound = std::unique_ptr<Ja::Sound, SoundDeleter>(raw)});
-        printWithDots("Sound : ", getFileName(file_path), "[ LOADED ]");
+        printWithDots("Sound", getFileName(file_path), "[ LOADED ]");
     }
 
     auto Cache::getMusic(const std::string& name) -> Ja::Music* {
         auto it = std::ranges::find_if(musics_, [&name](const auto& m) { return m.name == name; });
         if (it == musics_.end()) {
-            std::cerr << "Cache: music not found: " << name << '\n';
+            Log::error("Cache", "music not found: {}", name);
             throw std::runtime_error("Music not found: " + name);
         }
         return it->music.get();
@@ -111,7 +111,7 @@ namespace Resource {
     auto Cache::getSound(const std::string& name) -> Ja::Sound* {
         auto it = std::ranges::find_if(sounds_, [&name](const auto& s) { return s.name == name; });
         if (it == sounds_.end()) {
-            std::cerr << "Cache: sound not found: " << name << '\n';
+            Log::error("Cache", "sound not found: {}", name);
             throw std::runtime_error("Sound not found: " + name);
         }
         return it->sound.get();