feat: Add catalog generation functionality and related models

- Implemented CatalogResource for handling catalog generation requests and status checks.
- Created CatalogGenerationService to manage the asynchronous generation process.
- Added models for catalog generation responses, requests, and structured catalog data.
- Introduced utility scripts for database interaction and Kubernetes pod retrieval.
- Enhanced error handling and logging throughout the catalog generation workflow.

Scripts/DC_CATALOG_GEN_ALTER.sql

@@ -0,0 +1,47 @@
+-- =============================================================================
+-- DC_CATALOG_GEN_ALTER.sql
+-- Ergänzt dc_question_catalogs um Spalten für asynchrone Katalog-Generierung.
+-- Idempotent: Fehler "Spalte existiert bereits" wird ignoriert.
+-- =============================================================================
+
+BEGIN
+  EXECUTE IMMEDIATE '
+    ALTER TABLE dc_question_catalogs ADD (
+      generation_status  VARCHAR2(20)   DEFAULT ''READY'',
+      generation_error   VARCHAR2(4000)
+    )
+  ';
+  DBMS_OUTPUT.PUT_LINE('Spalten generation_status/generation_error angelegt.');
+EXCEPTION
+  WHEN OTHERS THEN
+    IF SQLCODE = -1430 THEN
+      DBMS_OUTPUT.PUT_LINE('Spalten existieren bereits – kein Änderungsbedarf.');
+    ELSE
+      RAISE;
+    END IF;
+END;
+/
+
+-- Bestehende Zeilen bekommen Status READY (Kataloge wurden manuell erstellt)
+UPDATE dc_question_catalogs
+SET    generation_status = 'READY'
+WHERE  generation_status IS NULL;
+
+COMMIT;
+
+-- Constraint nachträglich hinzufügen (idempotent)
+BEGIN
+  EXECUTE IMMEDIATE '
+    ALTER TABLE dc_question_catalogs
+    ADD CONSTRAINT chk_cat_gen_status
+    CHECK (generation_status IN (''GENERATING'', ''READY'', ''ERROR''))
+  ';
+EXCEPTION
+  WHEN OTHERS THEN
+    IF SQLCODE IN (-2264, -2261) THEN NULL; -- Constraint existiert bereits
+    ELSE RAISE;
+    END IF;
+END;
+/
+
+COMMIT;