feat: knowledge pipeline (#25360)

Signed-off-by: -LAN- <laipz8200@outlook.com>
Co-authored-by: twwu <twwu@dify.ai>
Co-authored-by: crazywoola <100913391+crazywoola@users.noreply.github.com>
Co-authored-by: jyong <718720800@qq.com>
Co-authored-by: Wu Tianwei <30284043+WTW0313@users.noreply.github.com>
Co-authored-by: QuantumGhost <obelisk.reg+git@gmail.com>
Co-authored-by: lyzno1 <yuanyouhuilyz@gmail.com>
Co-authored-by: quicksand <quicksandzn@gmail.com>
Co-authored-by: Jyong <76649700+JohnJyong@users.noreply.github.com>
Co-authored-by: lyzno1 <92089059+lyzno1@users.noreply.github.com>
Co-authored-by: zxhlyh <jasonapring2015@outlook.com>
Co-authored-by: Yongtao Huang <yongtaoh2022@gmail.com>
Co-authored-by: autofix-ci[bot] <114827586+autofix-ci[bot]@users.noreply.github.com>
Co-authored-by: Joel <iamjoel007@gmail.com>
Co-authored-by: Copilot <175728472+Copilot@users.noreply.github.com>
Co-authored-by: nite-knite <nkCoding@gmail.com>
Co-authored-by: Hanqing Zhao <sherry9277@gmail.com>
Co-authored-by: gemini-code-assist[bot] <176961590+gemini-code-assist[bot]@users.noreply.github.com>
Co-authored-by: Harry <xh001x@hotmail.com>

web/app/components/workflow/nodes/data-source-empty/default.ts

@@ -0,0 +1,22 @@
+import type { NodeDefault } from '../../types'
+import type { DataSourceEmptyNodeType } from './types'
+import { genNodeMetaData } from '@/app/components/workflow/utils'
+import { BlockEnum } from '@/app/components/workflow/types'
+
+const metaData = genNodeMetaData({
+  sort: -1,
+  type: BlockEnum.DataSourceEmpty,
+  isUndeletable: true,
+  isSingleton: true,
+})
+const nodeDefault: NodeDefault<DataSourceEmptyNodeType> = {
+  metaData,
+  defaultValue: {},
+  checkValid() {
+    return {
+      isValid: true,
+    }
+  },
+}
+
+export default nodeDefault