feat: last run frontend (#21369)

The frontend of feat: Persist Variables for Enhanced Debugging Workflow (#20699).

Co-authored-by: jZonG <jzongcode@gmail.com>

web/app/components/workflow/nodes/llm/default.ts

@@ -1,8 +1,29 @@
+// import { RETRIEVAL_OUTPUT_STRUCT } from '../../constants'
 import { BlockEnum, EditionType } from '../../types'
 import { type NodeDefault, type PromptItem, PromptRole } from '../../types'
 import type { LLMNodeType } from './types'
 import { ALL_CHAT_AVAILABLE_BLOCKS, ALL_COMPLETION_AVAILABLE_BLOCKS } from '@/app/components/workflow/blocks'
 
+const RETRIEVAL_OUTPUT_STRUCT = `{
+  "content": "",
+  "title": "",
+  "url": "",
+  "icon": "",
+  "metadata": {
+    "dataset_id": "",
+    "dataset_name": "",
+    "document_id": [],
+    "document_name": "",
+    "document_data_source_type": "",
+    "segment_id": "",
+    "segment_position": "",
+    "segment_word_count": "",
+    "segment_hit_count": "",
+    "segment_index_node_hash": "",
+    "score": ""
+  }
+}`
+
 const i18nPrefix = 'workflow.errorMsg'
 
 const nodeDefault: NodeDefault<LLMNodeType> = {
@@ -27,6 +48,10 @@ const nodeDefault: NodeDefault<LLMNodeType> = {
       enabled: false,
     },
   },
+  defaultRunInputData: {
+    '#context#': [RETRIEVAL_OUTPUT_STRUCT],
+    '#files#': [],
+  },
   getAvailablePrevNodes(isChatMode: boolean) {
     const nodes = isChatMode
       ? ALL_CHAT_AVAILABLE_BLOCKS