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/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");
     }