feat: Enhance entity options retrieval with additional fields support

- Updated the `getEntityOptions` function to accept an optional `fields` parameter, allowing clients to specify additional columns to be retrieved.
- Implemented logic to dynamically include extra columns in the SQL query based on the provided `fields`, improving flexibility in data retrieval.
- Enhanced the response to indicate whether extra fields were included, facilitating better client-side handling of the data.
- Added logging for authentication failures in the `AuthGuard` component to improve debugging and user experience.
- Integrated auto-fill functionality in the `V2Select` component to automatically populate fields based on selected entity references, enhancing user interaction.
- Updated the `ItemSearchModal` to support multi-selection of items, improving usability in item management scenarios.

frontend/lib/registry/DynamicComponentRenderer.tsx

@@ -8,6 +8,76 @@ import { filterDOMProps } from "@/lib/utils/domPropsFilter";
 
 // 통합 폼 시스템 import
 import { useV2FormOptional } from "@/components/v2/V2FormContext";
+import { apiClient } from "@/lib/api/client";
+
+// 컬럼 메타데이터 캐시 (테이블명 → 컬럼 설정 맵)
+const columnMetaCache: Record<string, Record<string, any>> = {};
+const columnMetaLoading: Record<string, Promise<void>> = {};
+
+async function loadColumnMeta(tableName: string): Promise<void> {
+  if (columnMetaCache[tableName] || columnMetaLoading[tableName]) return;
+
+  columnMetaLoading[tableName] = (async () => {
+    try {
+      const response = await apiClient.get(`/table-management/tables/${tableName}/columns?size=1000`);
+      const data = response.data.data || response.data;
+      const columns = data.columns || data || [];
+      const map: Record<string, any> = {};
+      for (const col of columns) {
+        const name = col.column_name || col.columnName;
+        if (name) map[name] = col;
+      }
+      columnMetaCache[tableName] = map;
+    } catch {
+      columnMetaCache[tableName] = {};
+    } finally {
+      delete columnMetaLoading[tableName];
+    }
+  })();
+
+  await columnMetaLoading[tableName];
+}
+
+// table_type_columns 기반 componentConfig 병합 (기존 설정이 없을 때만 DB 메타데이터로 보완)
+function mergeColumnMeta(tableName: string | undefined, columnName: string | undefined, componentConfig: any): any {
+  if (!tableName || !columnName) return componentConfig;
+
+  const meta = columnMetaCache[tableName]?.[columnName];
+  if (!meta) return componentConfig;
+
+  const inputType = meta.input_type || meta.inputType;
+  if (!inputType) return componentConfig;
+
+  // 이미 source가 올바르게 설정된 경우 건드리지 않음
+  const existingSource = componentConfig?.source;
+  if (existingSource && existingSource !== "static" && existingSource !== "distinct" && existingSource !== "select") {
+    return componentConfig;
+  }
+
+  const merged = { ...componentConfig };
+
+  // source가 미설정/기본값일 때만 DB 메타데이터로 보완
+  if (inputType === "entity") {
+    const refTable = meta.reference_table || meta.referenceTable;
+    const refColumn = meta.reference_column || meta.referenceColumn;
+    const displayCol = meta.display_column || meta.displayColumn;
+    if (refTable && !merged.entityTable) {
+      merged.source = "entity";
+      merged.entityTable = refTable;
+      merged.entityValueColumn = refColumn || "id";
+      merged.entityLabelColumn = displayCol || "name";
+    }
+  } else if (inputType === "category" && !existingSource) {
+    merged.source = "category";
+  } else if (inputType === "select" && !existingSource) {
+    const detail = typeof meta.detail_settings === "string" ? JSON.parse(meta.detail_settings || "{}") : (meta.detail_settings || {});
+    if (detail.options && !merged.options?.length) {
+      merged.options = detail.options;
+    }
+  }
+
+  return merged;
+}
 
 // 컴포넌트 렌더러 인터페이스
 export interface ComponentRenderer {
@@ -175,6 +245,15 @@ export const DynamicComponentRenderer: React.FC<DynamicComponentRendererProps> =
   children,
   ...props
 }) => {
+  // 컬럼 메타데이터 로드 트리거 (테이블명이 있으면 비동기 로드)
+  const screenTableName = props.tableName || (component as any).tableName;
+  const [, forceUpdate] = React.useState(0);
+  React.useEffect(() => {
+    if (screenTableName && !columnMetaCache[screenTableName]) {
+      loadColumnMeta(screenTableName).then(() => forceUpdate((v) => v + 1));
+    }
+  }, [screenTableName]);
+
   // 컴포넌트 타입 추출 - 새 시스템에서는 componentType 속성 사용, 레거시는 type 사용
   // 🆕 V2 레이아웃의 경우 url에서 컴포넌트 타입 추출 (예: "@/lib/registry/components/v2-input" → "v2-input")
   const extractTypeFromUrl = (url: string | undefined): string | undefined => {
@@ -550,24 +629,34 @@ export const DynamicComponentRenderer: React.FC<DynamicComponentRendererProps> =
           height: finalStyle.height,
         };
 
+        // 컬럼 메타데이터 기반 componentConfig 병합 (DB 최신 설정 우선)
+        const isEntityJoinColumn = fieldName?.includes(".");
+        const baseColumnName = isEntityJoinColumn ? undefined : fieldName;
+        const mergedComponentConfig = mergeColumnMeta(screenTableName, baseColumnName, component.componentConfig || {});
+
+        // 엔티티 조인 컬럼은 런타임에서 readonly/disabled 강제 해제
+        const effectiveComponent = isEntityJoinColumn
+          ? { ...component, componentConfig: mergedComponentConfig, readonly: false }
+          : { ...component, componentConfig: mergedComponentConfig };
+
         const rendererProps = {
-          component,
+          component: effectiveComponent,
           isSelected,
           onClick,
           onDragStart,
           onDragEnd,
           size: component.size || newComponent.defaultSize,
           position: component.position,
-          config: component.componentConfig,
-          componentConfig: component.componentConfig,
+          config: mergedComponentConfig,
+          componentConfig: mergedComponentConfig,
           // componentConfig의 모든 속성을 props로 spread (tableName, displayField 등)
-          ...(component.componentConfig || {}),
+          ...(mergedComponentConfig || {}),
           // 🔧 style은 맨 마지막에! (componentConfig.style이 있어도 mergedStyle이 우선)
           style: mergedStyle,
           // 🆕 라벨 표시 (labelDisplay가 true일 때만)
           label: effectiveLabel,
-          // 🆕 V2 레이아웃에서 overrides에서 복원된 상위 레벨 속성들도 전달
-          inputType: (component as any).inputType || component.componentConfig?.inputType,
+          // 🆕 V2 레이아웃에서 overrides에서 복원된 상위 레벨 속성들도 전달 (DB 메타데이터 우선)
+          inputType: (baseColumnName && columnMetaCache[screenTableName || ""]?.[baseColumnName]?.input_type) || (component as any).inputType || mergedComponentConfig?.inputType,
           columnName: (component as any).columnName || component.componentConfig?.columnName,
           value: currentValue, // formData에서 추출한 현재 값 전달
           // 새로운 기능들 전달
@@ -607,9 +696,8 @@ export const DynamicComponentRenderer: React.FC<DynamicComponentRendererProps> =
           // componentConfig.mode가 있으면 유지 (entity-search-input의 UI 모드)
           mode: component.componentConfig?.mode || mode,
           isInModal,
-          readonly: component.readonly,
-          // 🆕 disabledFields 체크 또는 기존 readonly
-          disabled: disabledFields?.includes(fieldName) || component.readonly,
+          readonly: isEntityJoinColumn ? false : component.readonly,
+          disabled: isEntityJoinColumn ? false : (disabledFields?.includes(fieldName) || component.readonly),
           originalData,
           allComponents,
           onUpdateLayout,