feat: add pipeline status monitoring dialog

- Add pipeline status API and types
- Create PipelineStatusDialog component with position control
- Unify modal overlay style across components

lightrag_webui/src/api/lightrag.ts

@@ -141,6 +141,20 @@ export type AuthStatusResponse = {
   api_version?: string
 }
 
+export type PipelineStatusResponse = {
+  autoscanned: boolean
+  busy: boolean
+  job_name: string
+  job_start?: string
+  docs: number
+  batchs: number
+  cur_batch: number
+  request_pending: boolean
+  latest_message: string
+  history_messages?: string[]
+  update_status?: Record<string, any>
+}
+
 export type LoginResponse = {
   access_token: string
   token_type: string
@@ -424,6 +438,11 @@ export const getAuthStatus = async (): Promise<AuthStatusResponse> => {
   }
 }
 
+export const getPipelineStatus = async (): Promise<PipelineStatusResponse> => {
+  const response = await axiosInstance.get('/documents/pipeline_status')
+  return response.data
+}
+
 export const loginToServer = async (username: string, password: string): Promise<LoginResponse> => {
   const formData = new FormData();
   formData.append('username', username);