feat: support rss datasource (#13721)

### What problem does this PR solve?

Supporting public RSS/Atom feed URLs as data sources for RagFlow.

link https://github.com/infiniflow/ragflow/issues/12313

### Type of change

- [x] New Feature (non-breaking change which adds functionality)

web/src/locales/en.ts

@@ -1000,6 +1000,8 @@ Example: Virtual Hosted Style`,
       newDocs: 'New docs',
       timeStarted: 'Time started',
       log: 'Log',
+      rssDescription:
+        'Connect to a public RSS or Atom feed and sync feed entries into your knowledge base.',
       confluenceDescription:
         'Integrate your Confluence workspace to search documentation.',
       s3Description:

web/src/locales/zh.ts

@@ -895,6 +895,8 @@ General：实体和关系提取提示来自 GitHub - microsoft/graphrag：基于
       newDocs: '新文档',
       timeStarted: '开始时间',
       log: '日志',
+      rssDescription:
+        '连接公开的 RSS 或 Atom feed，并将 feed 条目同步到知识库。',
       confluenceDescription: '连接你的 Confluence 工作区以搜索文档内容。',
       s3Description: ' 连接你的 AWS S3 存储桶以导入和同步文件。',
       google_cloud_storageDescription:

web/src/pages/user-setting/data-source/constant/index.tsx

@@ -2,7 +2,7 @@ import { FormFieldType } from '@/components/dynamic-form';
 import { IconFontFill } from '@/components/icon-font';
 import SvgIcon from '@/components/svg-icon';
 import { t, TFunction } from 'i18next';
-import { Mail } from 'lucide-react';
+import { Mail, Rss } from 'lucide-react';
 import { useEffect, useState } from 'react';
 import { useTranslation } from 'react-i18next';
 import BoxTokenField from '../component/box-token-field';
@@ -15,6 +15,7 @@ import { S3Constant } from './s3-constant';
 import { seafileConstant } from './seafile-constant';
 
 export enum DataSourceKey {
+  RSS = 'rss',
   CONFLUENCE = 'confluence',
   S3 = 's3',
   NOTION = 'notion',
@@ -47,6 +48,11 @@ export enum DataSourceKey {
 
 export const generateDataSourceInfo = (t: TFunction) => {
   return {
+    [DataSourceKey.RSS]: {
+      name: 'RSS',
+      description: t(`setting.${DataSourceKey.RSS}Description`),
+      icon: <Rss className="text-text-primary" size={22} />,
+    },
     [DataSourceKey.GOOGLE_CLOUD_STORAGE]: {
       name: 'Google Cloud Storage',
       description: t(
@@ -222,6 +228,25 @@ export const DataSourceFormBaseFields = [
   },
 ];
 export const DataSourceFormFields = {
+  [DataSourceKey.RSS]: [
+    {
+      label: 'Feed URL',
+      name: 'config.feed_url',
+      type: FormFieldType.Text,
+      required: true,
+      placeholder: 'https://example.com/feed.xml',
+    },
+    {
+      label: 'Batch Size',
+      name: 'config.batch_size',
+      type: FormFieldType.Number,
+      required: false,
+      validation: {
+        min: 1,
+        message: 'Batch Size must be at least 1',
+      },
+    },
+  ],
   [DataSourceKey.GOOGLE_CLOUD_STORAGE]: [
     {
       label: 'GCS Access Key ID',
@@ -965,6 +990,14 @@ export const DataSourceFormFields = {
 };
 
 export const DataSourceFormDefaultValues = {
+  [DataSourceKey.RSS]: {
+    name: '',
+    source: DataSourceKey.RSS,
+    config: {
+      feed_url: '',
+      batch_size: 2,
+    },
+  },
   [DataSourceKey.S3]: {
     name: '',
     source: DataSourceKey.S3,