feat: Add procedure and function management in flow controller

- Introduced new endpoints in FlowController for listing procedures and retrieving procedure parameters, enhancing the flow management capabilities.
- Updated FlowDataMoveService to support procedure calls during data movement, ensuring seamless integration with external and internal databases.
- Enhanced NodeFlowExecutionService to execute procedure call actions, allowing for dynamic execution of stored procedures within flow nodes.
- Updated frontend components to support procedure selection and parameter management, improving user experience in configuring flow steps.
- Added necessary types and API functions for handling procedure-related data, ensuring type safety and clarity in implementation.

frontend/lib/api/flow.ts

@@ -561,3 +561,61 @@ export async function updateFlowStepData(
     };
   }
 }
+
+// ============================================
+// 프로시저/함수 API
+// ============================================
+
+import type { ProcedureListItem, ProcedureParameterInfo } from "@/types/flowExternalDb";
+
+/**
+ * 프로시저/함수 목록 조회
+ */
+export async function getFlowProcedures(
+  dbSource: "internal" | "external",
+  connectionId?: number,
+  schema?: string,
+): Promise<ApiResponse<ProcedureListItem[]>> {
+  try {
+    const params = new URLSearchParams({ dbSource });
+    if (connectionId) params.set("connectionId", String(connectionId));
+    if (schema) params.set("schema", schema);
+
+    const response = await fetch(`${API_BASE}/flow/procedures?${params.toString()}`, {
+      headers: getAuthHeaders(),
+      credentials: "include",
+    });
+
+    return await response.json();
+  } catch (error: any) {
+    return { success: false, error: error.message };
+  }
+}
+
+/**
+ * 프로시저/함수 파라미터 조회
+ */
+export async function getFlowProcedureParameters(
+  name: string,
+  dbSource: "internal" | "external",
+  connectionId?: number,
+  schema?: string,
+): Promise<ApiResponse<ProcedureParameterInfo[]>> {
+  try {
+    const params = new URLSearchParams({ dbSource });
+    if (connectionId) params.set("connectionId", String(connectionId));
+    if (schema) params.set("schema", schema);
+
+    const response = await fetch(
+      `${API_BASE}/flow/procedures/${encodeURIComponent(name)}/parameters?${params.toString()}`,
+      {
+        headers: getAuthHeaders(),
+        credentials: "include",
+      },
+    );
+
+    return await response.json();
+  } catch (error: any) {
+    return { success: false, error: error.message };
+  }
+}