refactor: 数据处理向导拆分组合式函数与子面板

提取 useDataProcessDraft、useDataProcessGeneration 与 dataProcessCreateState 管理向导状态，新增 StructuredOptionsPanel、UnstructuredOptionsPanel、DatasetSplitEditor 子面板组件，样式抽离为独立 scss，DataProcessCreateView 与 TaskSetupStep 大幅瘦身，回归脚本适配。

frontend/src/views/data-process/create/useDataProcessGeneration.ts

@@ -0,0 +1,127 @@
+import { reactive, ref, type Ref } from 'vue'
+import { ElMessage } from 'element-plus'
+import { createResults } from './previewModel'
+import type {
+  GenerationState,
+  PreviewItem,
+  ProcessType,
+  ResultItem,
+  StructuredProcessOptions,
+  UnstructuredProcessOptions,
+} from './types'
+
+interface GenerationBindings {
+  previewItems: Ref<PreviewItem[]>
+  processType: Ref<ProcessType>
+  structuredOptions: Ref<StructuredProcessOptions>
+  unstructuredOptions: Ref<UnstructuredProcessOptions>
+  dirty: Ref<boolean>
+}
+
+export function useDataProcessGeneration(bindings: GenerationBindings) {
+  const results = ref<ResultItem[]>([])
+  const selectedResultId = ref<string | null>(null)
+  const generation = reactive<GenerationState>({
+    status: 'idle',
+    progress: 0,
+    message: '确认摘要后即可开始生成，过程中可查看实时进度。',
+  })
+  let generationTimer: ReturnType<typeof setInterval> | null = null
+
+  function stopGenerationTimer() {
+    if (generationTimer) clearInterval(generationTimer)
+    generationTimer = null
+  }
+
+  function resetDownstream() {
+    stopGenerationTimer()
+    generation.status = 'idle'
+    generation.progress = 0
+    generation.message = '确认摘要后即可开始生成，过程中可查看实时进度。'
+    results.value = []
+    selectedResultId.value = null
+  }
+
+  function startGeneration() {
+    stopGenerationTimer()
+    generation.status = 'running'
+    generation.progress = 0
+    generation.message = '正在应用预览修改并生成标准化结果，请稍候。'
+
+    generationTimer = setInterval(() => {
+      generation.progress = Math.min(100, generation.progress + 8)
+      if (generation.progress < 100) return
+
+      stopGenerationTimer()
+      generation.status = 'success'
+      results.value = createResults(
+        bindings.previewItems.value,
+        bindings.processType.value === 'structured'
+          ? bindings.structuredOptions.value
+          : bindings.processType.value === 'unstructured'
+            ? bindings.unstructuredOptions.value
+            : undefined,
+      )
+      generation.message = `已完成 ${results.value.length.toLocaleString()} 条数据处理，可进入结果页检查。`
+      selectedResultId.value = results.value[0]?.id ?? null
+      bindings.dirty.value = true
+      ElMessage.success('数据处理完成')
+    }, 180)
+  }
+
+  function stopGeneration() {
+    stopGenerationTimer()
+    generation.status = 'failed'
+    generation.message = '任务已停止，预览修改仍然保留，可以重新生成。'
+  }
+
+  function updateResultField(id: string, field: 'instruction' | 'input' | 'output', value: string) {
+    const item = results.value.find((entry) => entry.id === id)
+    if (!item) return
+    item[field] = value
+    const valid = item.instruction.trim() && item.output.trim()
+    item.error = valid ? undefined : 'Instruction 和 Output 不能为空'
+    const changed = item.instruction !== item.originalInstruction
+      || item.input !== item.originalInput
+      || item.output !== item.originalOutput
+    item.status = item.error ? 'invalid' : changed ? 'modified' : 'valid'
+    bindings.dirty.value = true
+  }
+
+  function restoreResult(id: string) {
+    const item = results.value.find((entry) => entry.id === id)
+    if (!item) return
+    item.instruction = item.originalInstruction
+    item.input = item.originalInput
+    item.output = item.originalOutput
+    item.error = undefined
+    item.status = 'valid'
+    bindings.dirty.value = true
+  }
+
+  function validateResults() {
+    let firstInvalidId: string | null = null
+    for (const item of results.value) {
+      if (!item.instruction.trim() || !item.output.trim()) {
+        item.error = 'Instruction 和 Output 不能为空'
+        item.status = 'invalid'
+        firstInvalidId ??= item.id
+      }
+    }
+    if (firstInvalidId) selectedResultId.value = firstInvalidId
+    return firstInvalidId == null
+  }
+
+  return {
+    generation,
+    results,
+    selectedResultId,
+    resetDownstream,
+    restoreResult,
+    startGeneration,
+    stopGeneration,
+    stopGenerationTimer,
+    updateResultField,
+    validateResults,
+  }
+}