refactor(log): migra core/input i core/audio a Log::

- gamepad_manager.cpp (12 logs): connect/disconnect com a info,
  errors d'open/init com a error, warning per BD no carregada.
- key_config.cpp (5 logs): error per arxius malformats, info
  per al recompte de bindings carregats.
- gamepad_bindings.cpp (4 logs): error/info anàleg.
- audio_effects.cpp (2 errors de format).
- sound_effects_config.cpp (3 logs): warn quan no hi ha presets,
  error de parse.

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

source/core/audio/audio_effects.cpp

@@ -5,10 +5,10 @@
 #include <cmath>
 #include <cstdint>
 #include <cstring>
-#include <iostream>
 #include <vector>
 
 #include "core/audio/jail_audio.hpp"
+#include "utils/log.hpp"
 
 namespace AudioEffects {
 
@@ -46,11 +46,11 @@ namespace AudioEffects {
             } else if (spec.format == SDL_AUDIO_U8) {
                 bytes_per_sample = 1;
             } else {
-                std::cerr << "AudioEffects: format de so no suportat (només U8 o S16)\n";
+                Log::error("AudioEffects", "format de so no suportat (només U8 o S16)");
                 return false;
             }
             if (spec.channels < 1 || spec.channels > 2) {
-                std::cerr << "AudioEffects: el so ha de ser mono o estèreo\n";
+                Log::error("AudioEffects", "el so ha de ser mono o estèreo");
                 return false;
             }
 

source/core/audio/sound_effects_config.cpp

@@ -1,10 +1,10 @@
 #include "core/audio/sound_effects_config.hpp"
 
-#include <iostream>
 #include <string>
 
 #include "core/resources/resource_helper.hpp"
 #include "external/fkyaml_node.hpp"
+#include "utils/log.hpp"
 
 namespace {
 
@@ -27,7 +27,7 @@ auto SoundEffectsConfig::get() -> SoundEffectsConfig& {
 void SoundEffectsConfig::load(const std::string& file_path) {
     auto bytes = Resource::Helper::loadFile(file_path);
     if (bytes.empty()) {
-        std::cerr << "SoundEffectsConfig: no s'ha pogut obrir " << file_path << " — cap preset d'efecte disponible\n";
+        Log::warn("SoundEffectsConfig", "no s'ha pogut obrir {} — cap preset d'efecte disponible", file_path);
         return;
     }
 
@@ -60,9 +60,9 @@ void SoundEffectsConfig::load(const std::string& file_path) {
             }
         }
 
-        std::cout << "SoundEffectsConfig: " << echoes_.size() << " preset(s) d'eco i " << reverbs_.size() << " de reverb des de " << file_path << '\n';
+        Log::info("SoundEffectsConfig", "{} preset(s) d'eco i {} de reverb des de {}", echoes_.size(), reverbs_.size(), file_path);
     } catch (const std::exception& e) {
-        std::cerr << "SoundEffectsConfig: error parsejant " << file_path << ": " << e.what() << '\n';
+        Log::error("SoundEffectsConfig", "error parsejant {}: {}", file_path, e.what());
     }
 }