fix #495: add schema preflight and DDL details

src/main/java/com/cloudhandson/vpdbackoffice/domain/schema/SchemaActionResult.java

@@ -4,6 +4,11 @@ public record SchemaActionResult(
     String objectName,
     String action,
     String status,
-    String message
+    String message,
+    String sqlText
 ) {
+
+  public SchemaActionResult(String objectName, String action, String status, String message) {
+    this(objectName, action, status, message, null);
+  }
 }

src/main/java/com/cloudhandson/vpdbackoffice/domain/schema/SchemaPreflightCheck.java

@@ -0,0 +1,28 @@
+package com.cloudhandson.vpdbackoffice.domain.schema;
+
+public record SchemaPreflightCheck(
+    String layer,
+    String itemName,
+    String objectType,
+    String status,
+    String detail,
+    String nextAction,
+    boolean sqlclRequired
+) {
+
+  public boolean ok() {
+    return "OK".equalsIgnoreCase(status);
+  }
+
+  public boolean warning() {
+    return "WARN".equalsIgnoreCase(status);
+  }
+
+  public boolean missing() {
+    return "MISSING".equalsIgnoreCase(status);
+  }
+
+  public boolean error() {
+    return "ERROR".equalsIgnoreCase(status);
+  }
+}

src/main/java/com/cloudhandson/vpdbackoffice/domain/schema/SchemaPreflightView.java

@@ -0,0 +1,38 @@
+package com.cloudhandson.vpdbackoffice.domain.schema;
+
+import java.util.List;
+
+public record SchemaPreflightView(
+    String currentUser,
+    String recommendedOrdsSchema,
+    List<SchemaPreflightCheck> checks,
+    String appDdlPreview,
+    String sqlclScript
+) {
+
+  public long okCount() {
+    return count("OK");
+  }
+
+  public long warnCount() {
+    return count("WARN");
+  }
+
+  public long missingCount() {
+    return count("MISSING");
+  }
+
+  public long errorCount() {
+    return count("ERROR");
+  }
+
+  public boolean hasActionNeeded() {
+    return warnCount() + missingCount() + errorCount() > 0;
+  }
+
+  private long count(String status) {
+    return checks.stream()
+        .filter(check -> status.equalsIgnoreCase(check.status()))
+        .count();
+  }
+}