fix: 컴포넌트 등록 및 entity-search 검증 개선

- 컴포넌트 등록을 useEffect → 즉시 실행으로 변경 (3개 컴포넌트)
- entity-search-input tableName 검증 추가 (FE/BE)
- DynamicComponentRenderer에서 componentConfig props 전달 수정
- EntitySearchModal key prop 경고 해결
- 불필요한 ScreenDesigner 렌더링 코드 제거

Fixes: 컴포넌트 미등록 에러, tableName undefined 500 에러, React key 경고

frontend/lib/registry/components/entity-search-input/EntitySearchModal.tsx

@@ -155,17 +155,19 @@ export function EntitySearchModal({
                     </td>
                   </tr>
                 ) : (
-                  results.map((item, index) => (
-                    <tr
-                      key={item[valueField] || index}
-                      className="border-t hover:bg-accent cursor-pointer transition-colors"
-                      onClick={() => handleSelect(item)}
-                    >
-                      {displayColumns.map((col, colIndex) => (
-                        <td key={`${item[valueField] || index}-${col}-${colIndex}`} className="px-4 py-2">
-                          {item[col] || "-"}
-                        </td>
-                      ))}
+                  results.map((item, index) => {
+                    const uniqueKey = item[valueField] !== undefined ? `${item[valueField]}` : `row-${index}`;
+                    return (
+                      <tr
+                        key={uniqueKey}
+                        className="border-t hover:bg-accent cursor-pointer transition-colors"
+                        onClick={() => handleSelect(item)}
+                      >
+                        {displayColumns.map((col) => (
+                          <td key={`${uniqueKey}-${col}`} className="px-4 py-2">
+                            {item[col] || "-"}
+                          </td>
+                        ))}
                       <td className="px-4 py-2">
                         <Button
                           size="sm"
@@ -180,7 +182,8 @@ export function EntitySearchModal({
                         </Button>
                       </td>
                     </tr>
-                  ))
+                  );
+                  })
                 )}
               </tbody>
             </table>