feat: 数据集版本管理支持删除历史版本

DatasetVersionList 新增 next_version_number，API 与 Mock 补充删除版本接口与并发控制，DatasetVersionBar 增加删除操作并对初始版本与最后版本禁用，DatasetPreviewView 接入删除流程，回归脚本与设计走查同步。

frontend/src/mock/adapter.ts

@@ -27,7 +27,10 @@ import {
   activateDatasetVersion,
   appendDatasetVersion,
   createInitialVersionState,
+  deleteDatasetVersion,
+  DatasetVersionMutationError,
   getActiveDatasetVersion,
+  normalizeDatasetVersionState,
 } from './datasetVersions'
 import type { StoredDatasetVersion, StoredDatasetVersionState } from './datasetVersions'
 
@@ -83,7 +86,13 @@ function getVersionState(fileId: string): StoredDatasetVersionState {
   if (persisted) {
     try {
       const state = JSON.parse(persisted) as StoredDatasetVersionState
-      if (state.versions?.length && state.active_version_id) return state
+      if (state.versions?.length && state.active_version_id) {
+        const normalizedState = normalizeDatasetVersionState(state)
+        if (state.next_version_number !== normalizedState.next_version_number) {
+          persistVersionState(fileId, normalizedState)
+        }
+        return normalizedState
+      }
     } catch {
       // 版本数据损坏时回退到初始版本
     }
@@ -100,6 +109,14 @@ function versionMetadata(version: StoredDatasetVersion) {
   return metadata
 }
 
+function versionListResponse(state: StoredDatasetVersionState) {
+  return {
+    versions: state.versions.map(versionMetadata).sort((a, b) => b.version - a.version),
+    active_version_id: state.active_version_id,
+    next_version_number: state.next_version_number,
+  }
+}
+
 /** 通过路径 + method 匹配 mock 响应 */
 async function handleMock(config: AxiosRequestConfig) {
   await delay(150) // 模拟网络延迟
@@ -185,10 +202,7 @@ async function handleMock(config: AxiosRequestConfig) {
   if (m && method === 'get') {
     const fileId = decodeURIComponent(m[1])
     const state = getVersionState(fileId)
-    return ok({
-      versions: state.versions.map(versionMetadata).sort((a, b) => b.version - a.version),
-      active_version_id: state.active_version_id,
-    })
+    return ok(versionListResponse(state))
   }
   if (m && method === 'post') {
     const fileId = decodeURIComponent(m[1])
@@ -249,6 +263,30 @@ async function handleMock(config: AxiosRequestConfig) {
       ? ok({ version: versionMetadata(version), content: version.content })
       : fail('数据集版本不存在', 404)
   }
+  if (m && method === 'delete') {
+    const fileId = decodeURIComponent(m[1])
+    const versionId = decodeURIComponent(m[2])
+    const currentState = getVersionState(fileId)
+    if (params.expected_current_version_id !== currentState.active_version_id) {
+      return fail('当前版本已被其他用户更新，请刷新后重试', 409)
+    }
+
+    let nextState: StoredDatasetVersionState
+    try {
+      nextState = deleteDatasetVersion(currentState, versionId)
+    } catch (error) {
+      if (error instanceof DatasetVersionMutationError) {
+        return fail(error.message, error.status)
+      }
+      return fail('删除版本失败', 500)
+    }
+    try {
+      persistVersionState(fileId, nextState)
+    } catch {
+      return fail('浏览器 Mock 存储空间不足', 413)
+    }
+    return ok(versionListResponse(nextState))
+  }
 
   // ==================== 训练任务 ====================
   if (url === '/fine-tune' && method === 'get') return ok(mockFineTuneList)

frontend/src/mock/datasetVersions.ts

@@ -9,6 +9,18 @@ export interface StoredDatasetVersion {
 export interface StoredDatasetVersionState {
   versions: StoredDatasetVersion[]
   active_version_id: string
+  /** 下次创建版本时使用的序号，确保已删除的版本号不会被复用。 */
+  next_version_number: number
+}
+
+export class DatasetVersionMutationError extends Error {
+  constructor(
+    message: string,
+    readonly status: number,
+  ) {
+    super(message)
+    this.name = 'DatasetVersionMutationError'
+  }
 }
 
 export function createInitialVersionState(
@@ -22,7 +34,24 @@ export function createInitialVersionState(
     description: '初始版本',
     content,
   }
-  return { versions: [version], active_version_id: version.id }
+  return { versions: [version], active_version_id: version.id, next_version_number: 2 }
+}
+
+/** 为旧版 localStorage 数据补齐单调递增的版本号游标。 */
+export function normalizeDatasetVersionState(
+  state: Omit<StoredDatasetVersionState, 'next_version_number'> & {
+    next_version_number?: number
+  },
+): StoredDatasetVersionState {
+  const minimumNextNumber = Math.max(0, ...state.versions.map((item) => item.version)) + 1
+  const nextVersionNumber = Number.isInteger(state.next_version_number)
+    ? Math.max(minimumNextNumber, state.next_version_number as number)
+    : minimumNextNumber
+
+  return {
+    ...state,
+    next_version_number: nextVersionNumber,
+  }
 }
 
 /** 追加不可变版本快照，并自动把新版本设为当前版本。 */
@@ -32,7 +61,7 @@ export function appendDatasetVersion(
   createTime: string,
   description = '在线编辑',
 ): StoredDatasetVersionState {
-  const nextNumber = Math.max(0, ...state.versions.map((item) => item.version)) + 1
+  const nextNumber = state.next_version_number
   const version: StoredDatasetVersion = {
     id: `v${nextNumber}`,
     version: nextNumber,
@@ -43,6 +72,32 @@ export function appendDatasetVersion(
   return {
     versions: [...state.versions, version],
     active_version_id: version.id,
+    next_version_number: nextNumber + 1,
+  }
+}
+
+/** 删除非当前、非初始的历史版本，并保留版本号游标。 */
+export function deleteDatasetVersion(
+  state: StoredDatasetVersionState,
+  versionId: string,
+): StoredDatasetVersionState {
+  const version = state.versions.find((item) => item.id === versionId)
+  if (!version) {
+    throw new DatasetVersionMutationError('数据集版本不存在', 404)
+  }
+  if (state.versions.length === 1) {
+    throw new DatasetVersionMutationError('唯一版本不可删除', 400)
+  }
+  if (version.id === state.active_version_id) {
+    throw new DatasetVersionMutationError('当前版本不可删除，请先切换到其他版本', 409)
+  }
+  if (version.version === 1) {
+    throw new DatasetVersionMutationError('初始版本不可删除', 400)
+  }
+
+  return {
+    ...state,
+    versions: state.versions.filter((item) => item.id !== versionId),
   }
 }