feat(engine): podman native — auto-detect runtime (docker→podman), compose mengikuti engine, doctor engine-agnostic

internal/i18n/locales/en.yaml

@@ -118,7 +118,7 @@ footer:
 toast:
   demoTitle: "✔ [ SUCCESS ] Conversion Saved"
   demoBody: "Stack 'web-app' saved to ~/.tia/stacks/web-app/"
-  dockerError: "✖ [ FAILED ] Docker"
+  dockerError: "✖ [ FAILED ] Engine"
   configError: "⚠ [ WARNING ] Config problem — using defaults"
   themeMode: "Theme mode: %s"
   timestamps: "Log timestamps: %s"
@@ -142,8 +142,8 @@ duration:
   minutes: "%d mins"
 
 doctor:
-  dockerDaemonUnreachable: "daemon not responding: %v"
-  dockerOk: "engine %s (API %s) · %d/%d containers running · %d images"
+  engineOk: "%s %s (API %s) · %d/%d containers running · %d images"
+  hostDefault: "(default)"
   stacksMissing: "%s (missing — created during onboarding)"
   configMissing: "%s (missing — using defaults)"
   composeOk: "%s · %s"