refactor: 项目架构重构 - 目录标准化 + 清理冗余

- 目录重命名: backend/wdkj-server/ → server/, frontend/ai-dimension/ → client/
- 删除 20+ 冗余文件（WDKJ 旧脚本、Windows 脚本、过时文档、设计稿）
- 更新 package.json 元数据（移除 wdkj 命名）
- 完善三级 .gitignore（根 + server + client）
- 重写 README.md 和 CHANGELOG.md
- 工具脚本移至 scripts/

client/src/stores/chat.js

@@ -0,0 +1,39 @@
+import { defineStore } from 'pinia'
+import { ref } from 'vue'
+import { aiChatApi } from '@/utils/api'
+
+export const useChatStore = defineStore('chat', () => {
+  const messages = ref([])
+  const quota = ref({ remaining: 0, total: 0 })
+  const loading = ref(false)
+
+  async function ask(question, dimension = 'general', token) {
+    loading.value = true
+    try {
+      const data = await aiChatApi.ask(question, dimension, token)
+      messages.value.push({ role: 'user', content: question })
+      messages.value.push({ role: 'assistant', content: data.answer })
+      quota.value.remaining = data.remainingQuota
+      return data
+    } finally {
+      loading.value = false
+    }
+  }
+
+  async function fetchQuota(token) {
+    try {
+      const data = await aiChatApi.quota(token)
+      quota.value = data
+      return data
+    } catch (err) {
+      console.error('[chatStore] fetchQuota failed:', err)
+      return null
+    }
+  }
+
+  function clearMessages() {
+    messages.value = []
+  }
+
+  return { messages, quota, loading, ask, fetchQuota, clearMessages }
+})

client/src/stores/index.js

@@ -0,0 +1,3 @@
+export { useUserStore } from './user'
+export { useKnowledgeStore } from './knowledge'
+export { useChatStore } from './chat'

client/src/stores/knowledge.js

@@ -0,0 +1,58 @@
+import { defineStore } from 'pinia'
+import { ref } from 'vue'
+import { knowledgeApi } from '@/utils/api'
+
+export const useKnowledgeStore = defineStore('knowledge', () => {
+  const list = ref([])
+  const currentDetail = ref(null)
+  const loading = ref(false)
+  const collected = ref([])
+
+  async function fetchList(params = {}) {
+    loading.value = true
+    try {
+      const data = await knowledgeApi.list(params)
+      list.value = data.list || data.items || []
+    } finally {
+      loading.value = false
+    }
+  }
+
+  async function fetchDetail(id) {
+    try {
+      currentDetail.value = await knowledgeApi.detail(id)
+      return currentDetail.value
+    } catch (err) {
+      console.error('[knowledgeStore] fetchDetail failed:', err)
+      return null
+    }
+  }
+
+  async function fetchCollected(token) {
+    try {
+      collected.value = await knowledgeApi.collected(token)
+      return collected.value
+    } catch (err) {
+      console.error('[knowledgeStore] fetchCollected failed:', err)
+      return []
+    }
+  }
+
+  async function toggleCollect(id, token) {
+    try {
+      const item = collected.value.find(i => i.id === id)
+      if (item) {
+        await knowledgeApi.uncollect(id, token)
+        collected.value = collected.value.filter(i => i.id !== id)
+      } else {
+        await knowledgeApi.collect(id, token)
+        collected.value.push({ id })
+      }
+    } catch (err) {
+      console.error('[knowledgeStore] toggleCollect failed:', err)
+      throw err
+    }
+  }
+
+  return { list, currentDetail, loading, collected, fetchList, fetchDetail, fetchCollected, toggleCollect }
+})

client/src/stores/user.js

@@ -0,0 +1,108 @@
+import { defineStore } from 'pinia'
+import { ref, computed } from 'vue'
+import { authApi } from '@/utils/api'
+
+export const useUserStore = defineStore('user', () => {
+  const token = ref(uni.getStorageSync('token') || '')
+  const userInfo = ref(null)
+  const subInfo = ref(null) // 订阅信息
+  const quota = ref(null)   // AI 问答配额
+  const isLoggedIn = computed(() => !!token.value)
+  const isSubscribed = computed(() => {
+    if (!subInfo.value) return false
+    const expires = new Date(subInfo.value.expiresAt)
+    return expires > new Date()
+  })
+  const subscriptionLevel = computed(() => {
+    if (!subInfo.value) return 'free'
+    const expires = new Date(subInfo.value.expiresAt)
+    if (expires <= new Date()) return 'free'
+    return subInfo.value.plan || 'pro'
+  })
+
+  async function login(code, userInfoData) {
+    const data = await authApi.login(code, userInfoData)
+    token.value = data.token
+    userInfo.value = data.userInfo
+    uni.setStorageSync('token', data.token)
+    return data
+  }
+
+  async function h5Login(username, password) {
+    const data = await authApi.h5Login(username, password)
+    token.value = data.token
+    userInfo.value = data.userInfo
+    uni.setStorageSync('token', data.token)
+    return data
+  }
+
+  async function h5Register(username, password, nickName) {
+    const data = await authApi.register(username, password, nickName)
+    token.value = data.token
+    userInfo.value = data.userInfo
+    uni.setStorageSync('token', data.token)
+    return data
+  }
+
+  async function fetchMe() {
+    try {
+      const data = await authApi.me(token.value)
+      userInfo.value = data
+      return data
+    } catch (err) {
+      console.error('[userStore] fetchMe failed:', err)
+      return null
+    }
+  }
+
+  async function fetchSubInfo(tokenVal) {
+    // 从后端获取订阅信息 - 复用 knowledgeApi 或专门接口
+    // 当前后端无单独订阅接口，从 /api/user/progress 中获取
+    const { userApi } = await import('@/utils/api')
+    try {
+      const progress = await userApi.progress(tokenVal)
+      if (progress && progress.subscription) {
+        subInfo.value = progress.subscription
+      }
+    } catch (err) {
+      console.error('[userStore] fetchSubInfo failed:', err)
+    }
+  }
+
+  async function fetchQuota(tokenVal) {
+    const { aiChatApi } = await import('@/utils/api')
+    try {
+      const data = await aiChatApi.quota(tokenVal)
+      quota.value = data
+      return data
+    } catch (err) {
+      console.error('[userStore] fetchQuota failed:', err)
+      return null
+    }
+  }
+
+  function logout() {
+    token.value = ''
+    userInfo.value = null
+    subInfo.value = null
+    quota.value = null
+    uni.removeStorageSync('token')
+  }
+
+  return {
+    token,
+    userInfo,
+    subInfo,
+    quota,
+    isLoggedIn,
+    isSubscribed,
+    subscriptionLevel,
+    login,
+    h5Login,
+    h5Register,
+    fetchMe,
+    fetchSubInfo,
+    fetchQuota,
+    logout
+  }
+})