Bootstrap-Refactoring: Init/Run-Trennung mit ApplicationRunContext

Führt ApplicationRunContext als package-private Record ein, der beim
GUI-Start einmalig aus der validierten Konfiguration gebaut wird
(migrate → load → validate → schema-init). Das Ergebnis wird in
guiApplicationRunContext gecacht und von launchGuiBatchRun,
launchGuiMiniBatchRun und resetDocumentStatusForGui wiederverwendet,
sodass die Init-Sequenz nicht bei jedem Lauf wiederholt wird.

GuiStartupContext erhält das neue Feld applicationContextError
(Optional<String>), das einen deutschen Fehlertext trägt, wenn der
Kontext bei Startup nicht initialisiert werden konnte. Alle bisherigen
Konstruktoren und die blank()-Fabrik wurden rückwärtskompatibel
ergänzt.

Der Test-Helfer runnerWithGuiFactory wirft jetzt
ConfigurationLoadingException statt AssertionError, damit
initializeApplicationRunContext() den Fehler gracefully abfangen
und in applicationContextError speichern kann.

Co-Authored-By: Claude Sonnet 4.6 <noreply@anthropic.com>

pdf-umbenenner-adapter-in-gui/src/main/java/de/gecheckt/pdf/umbenenner/adapter/in/gui/GuiStartupContext.java

@@ -51,6 +51,11 @@ import de.gecheckt.pdf.umbenenner.domain.model.DocumentFingerprint;
  * context for documents that were skipped in the current run, and the resolved application
  * version string that the status bar displays at the bottom of the main window.
  * <p>
+ * The optional {@code applicationContextError} carries a human-readable German error
+ * message when the bootstrap-side application run context could not be initialised at
+ * startup (e.g., invalid or incomplete configuration). An empty value signals that the
+ * run context was built successfully and batch runs can be launched immediately.
+ * <p>
  * All ports and services are supplied by Bootstrap so that the GUI adapter does not need to
  * know about provider-specific HTTP details or adapter wiring.
  */
@@ -78,7 +83,8 @@ public record GuiStartupContext(
         GuiHistoryResetDocumentStatusPort historyResetDocumentStatusPort,
         GuiDeleteDocumentHistoryPort deleteDocumentHistoryPort,
         GuiPromptEditorPortFactory promptEditorPortFactory,
-        GuiCreateNewDatabasePort createNewDatabasePort) {
+        GuiCreateNewDatabasePort createNewDatabasePort,
+        Optional<String> applicationContextError) {
 
     /**
      * Creates a fully wired startup context.
@@ -111,10 +117,13 @@ public record GuiStartupContext(
      *                                      {@code null} sein
      * @param promptEditorPortFactory       Fabrik für Prompt-Editor-Ports bei Konfigurationswechsel;
      *                                      darf nicht {@code null} sein
+     * @param applicationContextError       optional error message when the application run context
+     *                                      could not be initialised at startup; {@code null} becomes empty
      */
     public GuiStartupContext {
         initialState = Objects.requireNonNull(initialState, "initialState must not be null");
         startupNotice = startupNotice == null ? Optional.empty() : startupNotice;
+        applicationContextError = applicationContextError == null ? Optional.empty() : applicationContextError;
         configurationFileLoader = Objects.requireNonNull(configurationFileLoader,
                 "configurationFileLoader must not be null");
         configurationFileWriter = Objects.requireNonNull(configurationFileWriter,
@@ -202,7 +211,7 @@ public record GuiStartupContext(
                 noOpHistoricalDocumentContextPort(), "dev", noOpPromptEditorPort(),
                 noOpHistoryOverviewPort(), noOpHistoryDetailsPort(),
                 noOpHistoryResetPort(), noOpDeleteHistoryPort(), noOpPromptEditorPortFactory(),
-                rejectingCreateNewDatabasePort());
+                rejectingCreateNewDatabasePort(), Optional.empty());
     }
 
     /**
@@ -241,7 +250,7 @@ public record GuiStartupContext(
                 noOpHistoricalDocumentContextPort(), "dev", noOpPromptEditorPort(),
                 noOpHistoryOverviewPort(), noOpHistoryDetailsPort(),
                 noOpHistoryResetPort(), noOpDeleteHistoryPort(), noOpPromptEditorPortFactory(),
-                rejectingCreateNewDatabasePort());
+                rejectingCreateNewDatabasePort(), Optional.empty());
     }
 
     /**
@@ -280,7 +289,7 @@ public record GuiStartupContext(
                 noOpHistoricalDocumentContextPort(), "dev", noOpPromptEditorPort(),
                 noOpHistoryOverviewPort(), noOpHistoryDetailsPort(),
                 noOpHistoryResetPort(), noOpDeleteHistoryPort(), noOpPromptEditorPortFactory(),
-                rejectingCreateNewDatabasePort());
+                rejectingCreateNewDatabasePort(), Optional.empty());
     }
 
     private static GuiBatchRunLauncher rejectingBatchRunLauncher() {
@@ -403,7 +412,8 @@ public record GuiStartupContext(
                 noOpHistoryResetPort(),
                 noOpDeleteHistoryPort(),
                 noOpPromptEditorPortFactory(),
-                rejectingCreateNewDatabasePort());
+                rejectingCreateNewDatabasePort(),
+                Optional.empty());
     }
 
     /**