feat(config): internal/config (load/save atomik + validasi) — wiring bahasa/suara/animasi + doctor baca config

internal/i18n/i18n.go

@@ -6,7 +6,6 @@ package i18n
 import (
 	"embed"
 	"fmt"
-	"os"
 	"sort"
 	"sync"
 	"time"
@@ -34,9 +33,6 @@ func init() {
 			catalogs[lang] = c
 		}
 	}
-	if l := os.Getenv("TIA_LANG"); l != "" {
-		active = l
-	}
 }
 
 // shortcut: bahasa hanya dari TIA_LANG + default id — akan dibaca dari

internal/i18n/locales/en.yaml

@@ -61,6 +61,7 @@ toast:
   demoTitle: "✔ [ SUCCESS ] Conversion Saved"
   demoBody: "Stack 'web-app' saved to ~/.tia/stacks/web-app/"
   dockerError: "✖ [ FAILED ] Docker"
+  configError: "⚠ [ WARNING ] Config problem — using defaults"
 
 activity:
   coming: "Docker events listener coming (Phase 2)."
@@ -84,6 +85,7 @@ doctor:
   dockerDaemonUnreachable: "daemon not responding: %v"
   dockerOk: "engine %s (API %s) · %d/%d containers running · %d images"
   stacksMissing: "%s (missing — created during onboarding)"
+  configMissing: "%s (missing — using defaults)"
 
 cli:
   unknownCommand: "unknown command: %q"

internal/i18n/locales/id.yaml

@@ -61,6 +61,7 @@ toast:
   demoTitle: "✔ [ SUKSES ] Konversi Berhasil Disimpan"
   demoBody: "Stack 'web-app' tersimpan di ~/.tia/stacks/web-app/"
   dockerError: "✖ [ GAGAL ] Docker"
+  configError: "⚠ [ PERINGATAN ] Config bermasalah — memakai default"
 
 activity:
   coming: "Listener Docker events menyusul (Phase 2)."
@@ -84,6 +85,7 @@ doctor:
   dockerDaemonUnreachable: "daemon tidak merespons: %v"
   dockerOk: "engine %s (API %s) · %d/%d kontainer berjalan · %d image"
   stacksMissing: "%s (belum ada — dibuat saat onboarding)"
+  configMissing: "%s (belum ada — memakai default)"
 
 cli:
   unknownCommand: "perintah tidak dikenal: %q"