feat: add admin/profile UI, i18n (fr/de/pt), fix CI pipelines

- Add admin panel link and profile modal in user menu dropdown
- Add French, German and Portuguese locale support (full translations)
- Register new locales across JS frontend and Rust backend
- Create CI pipeline (fmt, clippy, test, audit, build)
- Fix docker-build.yml (cache, real tests, reduced timeout)
- Fix docker-publish.yml (multi-arch via QEMU, latest tag, pre-publish tests)
- Add dependabot.yml for automated dependency updates

src/application/dtos/i18n_dto.rs

@@ -16,6 +16,9 @@ impl From<Locale> for LocaleDto {
         let (code, name) = match locale {
             Locale::English => ("en", "English"),
             Locale::Spanish => ("es", "Español"),
+            Locale::French => ("fr", "Français"),
+            Locale::German => ("de", "Deutsch"),
+            Locale::Portuguese => ("pt", "Português"),
         };
         
         Self {

src/common/di.rs

@@ -456,6 +456,15 @@ impl AppServiceFactory {
         if let Err(e) = i18n_service.load_translations(Locale::Spanish).await {
             tracing::warn!("Failed to load Spanish translations: {}", e);
         }
+        if let Err(e) = i18n_service.load_translations(Locale::French).await {
+            tracing::warn!("Failed to load French translations: {}", e);
+        }
+        if let Err(e) = i18n_service.load_translations(Locale::German).await {
+            tracing::warn!("Failed to load German translations: {}", e);
+        }
+        if let Err(e) = i18n_service.load_translations(Locale::Portuguese).await {
+            tracing::warn!("Failed to load Portuguese translations: {}", e);
+        }
         tracing::info!("Translations preloaded");
     }
     

src/domain/services/i18n_service.rs

@@ -22,6 +22,9 @@ pub type I18nResult<T> = Result<T, I18nError>;
 pub enum Locale {
     English,
     Spanish,
+    French,
+    German,
+    Portuguese,
 }
 
 impl Locale {
@@ -30,6 +33,9 @@ impl Locale {
         match self {
             Locale::English => "en",
             Locale::Spanish => "es",
+            Locale::French => "fr",
+            Locale::German => "de",
+            Locale::Portuguese => "pt",
         }
     }
     
@@ -38,6 +44,9 @@ impl Locale {
         match code.to_lowercase().as_str() {
             "en" => Some(Locale::English),
             "es" => Some(Locale::Spanish),
+            "fr" => Some(Locale::French),
+            "de" => Some(Locale::German),
+            "pt" => Some(Locale::Portuguese),
             _ => None,
         }
     }

src/infrastructure/services/file_system_i18n_service.rs

@@ -139,7 +139,7 @@ impl I18nService for FileSystemI18nService {
     }
     
     async fn available_locales(&self) -> Vec<Locale> {
-        vec![Locale::English, Locale::Spanish]
+        vec![Locale::English, Locale::Spanish, Locale::French, Locale::German, Locale::Portuguese]
     }
     
     async fn is_supported(&self, locale: Locale) -> bool {