feat(studio): show module origin store ('from <store>')

StoreItem gains source (mapped from StoreEntry.source); the store grid
shows a 'from <store>' label for operator-added stores (bundled seed
unlabelled). Foundation for grouping by store. EN+DE l10n.

Signed-off-by: flemming-it <stefan.a.flemming@googlemail.com>

lib/l10n/app_de.arb

@@ -2,6 +2,7 @@
   "@@locale": "de",
   "errModuleDownload": "Modul-Download fehlgeschlagen",
   "errModuleDownloadHint": "Die Bundle-URL des Moduls ist nicht erreichbar (Statuscode unten). Der Hub läuft — URL/Host korrigieren oder anderen Store wählen.",
+  "storeFromSource": "aus {store}",
   "guidedSetupTitle": "Setup-Assistent",
   "guidedSetupIntro": "Beantworte drei Fragen — Ch∆In stellt passende Konfiguration, Modul-Set und Start-Flow zusammen.",
   "guidedSetupScenario": "Szenario",

lib/l10n/app_en.arb

@@ -2,6 +2,12 @@
   "@@locale": "en",
   "errModuleDownload": "Module download failed",
   "errModuleDownloadHint": "The module's bundle URL is unreachable (status code below). The hub is running fine — fix the URL/host or choose another store.",
+  "storeFromSource": "from {store}",
+  "@storeFromSource": {
+    "placeholders": {
+      "store": { "type": "String" }
+    }
+  },
   "guidedSetupTitle": "Setup assistant",
   "guidedSetupIntro": "Answer three questions and Ch∆In assembles a tailored config, module set and starter flow.",
   "guidedSetupScenario": "Scenario",

lib/l10n/app_localizations.dart

@@ -110,6 +110,12 @@ abstract class AppLocalizations {
   /// **'The module\'s bundle URL is unreachable (status code below). The hub is running fine — fix the URL/host or choose another store.'**
   String get errModuleDownloadHint;
 
+  /// No description provided for @storeFromSource.
+  ///
+  /// In en, this message translates to:
+  /// **'from {store}'**
+  String storeFromSource(String store);
+
   /// No description provided for @guidedSetupTitle.
   ///
   /// In en, this message translates to:

lib/l10n/app_localizations_de.dart

@@ -15,6 +15,11 @@ class AppLocalizationsDe extends AppLocalizations {
   String get errModuleDownloadHint =>
       'Die Bundle-URL des Moduls ist nicht erreichbar (Statuscode unten). Der Hub läuft — URL/Host korrigieren oder anderen Store wählen.';
 
+  @override
+  String storeFromSource(String store) {
+    return 'aus $store';
+  }
+
   @override
   String get guidedSetupTitle => 'Setup-Assistent';
 

lib/l10n/app_localizations_en.dart

@@ -15,6 +15,11 @@ class AppLocalizationsEn extends AppLocalizations {
   String get errModuleDownloadHint =>
       'The module\'s bundle URL is unreachable (status code below). The hub is running fine — fix the URL/host or choose another store.';
 
+  @override
+  String storeFromSource(String store) {
+    return 'from $store';
+  }
+
   @override
   String get guidedSetupTitle => 'Setup assistant';