feat: add test_load and test_parse binaries for configuration loading and parsing

apps/gateway/src/bin/test_load.rs

@@ -0,0 +1,21 @@
+use zesdex_domain::cms::AppConfigRepository;
+use zesdex_infrastructure::persistence::cms::app_config_repo::JsonAppConfigRepository;
+use std::path::PathBuf;
+
+fn main() {
+    let base_dir = dirs::home_dir().unwrap().join(".local/share/zesdex");
+    let repo = JsonAppConfigRepository::new();
+    let config = repo.load(&base_dir).unwrap();
+    
+    println!("Providers:");
+    for (k, v) in &config.providers {
+        println!(" - {} (default model: {:?})", k, v.default_model);
+    }
+    
+    println!("Default provider: {}", config.default_provider);
+    println!("Default model: {}", config.default_model);
+    println!("Model roles:");
+    for (k, v) in &config.model_roles {
+        println!(" - {}: provider={}, model={}", k, v.provider, v.model);
+    }
+}