全面架构重构：建立分层架构与高度可扩展的插件系统

后端重构：
- 新增分层架构：API Routes -> Services -> Repositories -> Infrastructure
- 彻底移除全局单例，全面采用 FastAPI 依赖注入
- 新增 api/ 目录拆分路由（proxies, plugins, scheduler, settings, stats）
- 新增 services/ 业务逻辑层：ProxyService, PluginService, SchedulerService, ValidatorService, SettingsService
- 新增 repositories/ 数据访问层：ProxyRepository, SettingsRepository, PluginSettingsRepository
- 新增 models/ 层：Pydantic Schemas + Domain Models
- 重写 core/config.py：采用 Pydantic Settings 管理配置
- 新增 core/db.py：基于 asynccontextmanager 的连接管理，支持数据库迁移
- 新增 core/exceptions.py：统一业务异常体系

插件系统重构（核心）：
- 新增 core/plugin_system/：BaseCrawlerPlugin + PluginRegistry
- 采用显式注册模式（装饰器 + plugins/__init__.py），类型安全、测试友好
- 新增 plugins/base.py：BaseHTTPPlugin 通用 HTTP 爬虫基类
- 迁移全部 7 个插件到新架构（fate0, proxylist_download, ip3366, ip89, kuaidaili, speedx, yundaili）
- 插件状态持久化到 plugin_settings 表

任务调度重构：
- 新增 core/tasks/queue.py：ValidationQueue + WorkerPool
- 解耦爬取与验证：爬虫只负责爬取，代理提交队列后由 Worker 异步验证
- 调度器定时从数据库拉取存量代理并分批投入验证队列

前端调整：
- 新增 frontend/src/services/ 层拆分 API 调用逻辑
- 调整 stores/ 和 views/ 使用 Service 层
- 保持 API 兼容性，页面无需大幅修改

其他：
- 新增 main.py 作为新入口
- 新增 DESIGN.md 架构设计文档
- 更新 requirements.txt 增加 pydantic-settings

frontend/src/services/pluginService.js

@@ -0,0 +1,19 @@
+import { pluginsAPI } from '../api'
+
+export const pluginService = {
+  async getPlugins() {
+    return pluginsAPI.getPlugins()
+  },
+
+  async togglePlugin(pluginId, enabled) {
+    return pluginsAPI.togglePlugin(pluginId, enabled)
+  },
+
+  async crawlPlugin(pluginId) {
+    return pluginsAPI.crawlPlugin(pluginId)
+  },
+
+  async crawlAll() {
+    return pluginsAPI.crawlAll()
+  }
+}

frontend/src/services/proxyService.js

@@ -0,0 +1,27 @@
+import { statsAPI, proxiesAPI } from '../api'
+
+export const proxyService = {
+  async getStats() {
+    return statsAPI.getStats()
+  },
+
+  async getProxies(params, signal) {
+    return proxiesAPI.getProxies(params, signal)
+  },
+
+  async deleteProxy(ip, port) {
+    return proxiesAPI.deleteProxy(ip, port)
+  },
+
+  async batchDelete(proxies) {
+    return proxiesAPI.batchDeleteProxies(proxies)
+  },
+
+  async cleanInvalid() {
+    return proxiesAPI.cleanInvalidProxies()
+  },
+
+  async export(format, protocol) {
+    return proxiesAPI.exportProxies(format, protocol)
+  }
+}

frontend/src/services/schedulerService.js

@@ -0,0 +1,19 @@
+import { schedulerAPI } from '../api'
+
+export const schedulerService = {
+  async start() {
+    return schedulerAPI.start()
+  },
+
+  async stop() {
+    return schedulerAPI.stop()
+  },
+
+  async validateNow() {
+    return schedulerAPI.validateNow()
+  },
+
+  async getStatus() {
+    return schedulerAPI.getStatus()
+  }
+}

frontend/src/services/settingService.js

@@ -0,0 +1,11 @@
+import { settingsAPI } from '../api'
+
+export const settingService = {
+  async getSettings() {
+    return settingsAPI.getSettings()
+  },
+
+  async saveSettings(data) {
+    return settingsAPI.saveSettings(data)
+  }
+}

frontend/src/stores/plugins.js

@@ -1,6 +1,6 @@
 import { defineStore } from 'pinia'
 import { ref, computed } from 'vue'
-import { pluginsAPI } from '../api'
+import { pluginService } from '../services/pluginService'
 
 /**
  * Plugins Store
@@ -24,7 +24,7 @@ export const usePluginsStore = defineStore('plugins', () => {
   async function fetchPlugins() {
     loading.value = true
     try {
-      const response = await pluginsAPI.getPlugins()
+      const response = await pluginService.getPlugins()
       if (response.code === 200) {
         plugins.value = response.data.plugins || []
         return true
@@ -45,7 +45,7 @@ export const usePluginsStore = defineStore('plugins', () => {
    */
   async function togglePlugin(pluginId, enabled) {
     try {
-      const response = await pluginsAPI.togglePlugin(pluginId, enabled)
+      const response = await pluginService.togglePlugin(pluginId, enabled)
       if (response.code === 200) {
         const plugin = plugins.value.find(p => p.id === pluginId)
         if (plugin) {
@@ -66,7 +66,7 @@ export const usePluginsStore = defineStore('plugins', () => {
    */
   async function crawlPlugin(pluginId) {
     try {
-      const response = await pluginsAPI.crawlPlugin(pluginId)
+      const response = await pluginService.crawlPlugin(pluginId)
       return response.code === 200
     } catch (error) {
       console.error('触发插件爬取失败:', error)

frontend/src/stores/proxy.js

@@ -1,6 +1,6 @@
 import { defineStore } from 'pinia'
 import { ref, computed } from 'vue'
-import { proxiesAPI, statsAPI } from '../api'
+import { proxyService } from '../services/proxyService'
 
 /**
  * 判断是否为用户取消的错误
@@ -34,7 +34,7 @@ export const useProxyStore = defineStore('proxy', () => {
    */
   async function fetchStats() {
     try {
-      const response = await statsAPI.getStats()
+      const response = await proxyService.getStats()
       if (response.code === 200) {
         stats.value = response.data
         return true
@@ -54,7 +54,7 @@ export const useProxyStore = defineStore('proxy', () => {
   async function fetchProxies(params, signal) {
     loading.value = true
     try {
-      const response = await proxiesAPI.getProxies(params, signal)
+      const response = await proxyService.getProxies(params, signal)
       if (response.code === 200) {
         proxies.value = response.data.list
         total.value = response.data.total
@@ -79,7 +79,7 @@ export const useProxyStore = defineStore('proxy', () => {
    */
   async function deleteProxy(ip, port) {
     try {
-      const response = await proxiesAPI.deleteProxy(ip, port)
+      const response = await proxyService.deleteProxy(ip, port)
       return response.code === 200
     } catch (error) {
       console.error('删除代理失败:', error)
@@ -96,7 +96,7 @@ export const useProxyStore = defineStore('proxy', () => {
     if (!proxyList?.length) return 0
     
     try {
-      const response = await proxiesAPI.batchDeleteProxies(proxyList)
+      const response = await proxyService.batchDelete(proxyList)
       if (response.code === 200) {
         return response.data.deleted_count
       }
@@ -112,7 +112,7 @@ export const useProxyStore = defineStore('proxy', () => {
    */
   async function cleanInvalidProxies() {
     try {
-      const response = await proxiesAPI.cleanInvalidProxies()
+      const response = await proxyService.cleanInvalid()
       if (response.code === 200) {
         return response.data.deleted_count
       }
@@ -130,7 +130,7 @@ export const useProxyStore = defineStore('proxy', () => {
    */
   async function exportProxies(format, protocol = null) {
     try {
-      const response = await proxiesAPI.exportProxies(format, protocol)
+      const response = await proxyService.export(format, protocol)
       
       // 创建下载链接
       const url = window.URL.createObjectURL(new Blob([response]))

frontend/src/views/Plugins.vue

@@ -138,7 +138,7 @@ import {
   Box
 } from '@element-plus/icons-vue'
 import { usePluginsStore } from '../stores/plugins'
-import { pluginsAPI } from '../api'
+import { pluginService } from '../services/pluginService'
 import { formatTime } from '../utils/format'
 import PageHeader from '../components/PageHeader.vue'
 
@@ -168,7 +168,7 @@ async function handleCrawl(pluginId) {
     crawlingPlugin.value = pluginId
     lastCrawlResult.value = null
     
-    const response = await pluginsAPI.crawlPlugin(pluginId)
+    const response = await pluginService.crawlPlugin(pluginId)
     
     if (response.code === 200) {
       lastCrawlResult.value = {
@@ -216,7 +216,7 @@ async function handleCrawlAll() {
     crawlingAll.value = true
     lastCrawlResult.value = null
     
-    const response = await pluginsAPI.crawlAll()
+    const response = await pluginService.crawlAll()
     
     if (response.code === 200) {
       lastCrawlResult.value = {

frontend/src/views/Settings.vue

@@ -190,7 +190,8 @@ import {
   VideoPause, 
   Refresh 
 } from '@element-plus/icons-vue'
-import { settingsAPI, schedulerAPI } from '../api'
+import { settingService } from '../services/settingService'
+import { schedulerService } from '../services/schedulerService'
 import PageHeader from '../components/PageHeader.vue'
 
 // ==================== 状态 ====================
@@ -237,7 +238,7 @@ const formRules = {
 async function fetchSettings() {
   loading.value = true
   try {
-    const response = await settingsAPI.getSettings()
+    const response = await settingService.getSettings()
     if (response.code === 200) {
       Object.assign(settings, response.data)
     }
@@ -251,7 +252,7 @@ async function fetchSettings() {
 
 async function fetchSchedulerStatus() {
   try {
-    const response = await schedulerAPI.getStatus()
+    const response = await schedulerService.getStatus()
     if (response.code === 200) {
       schedulerRunning.value = response.data.running
     }
@@ -264,7 +265,7 @@ async function fetchSchedulerStatus() {
 async function handleStartScheduler() {
   schedulerLoading.value = true
   try {
-    const response = await schedulerAPI.start()
+    const response = await schedulerService.start()
     if (response.code === 200) {
       schedulerRunning.value = true
       ElMessage.success('自动验证已启动')
@@ -282,7 +283,7 @@ async function handleStartScheduler() {
 async function handleStopScheduler() {
   schedulerLoading.value = true
   try {
-    const response = await schedulerAPI.stop()
+    const response = await schedulerService.stop()
     if (response.code === 200) {
       schedulerRunning.value = false
       ElMessage.success('自动验证已停止')
@@ -310,7 +311,7 @@ async function handleValidateNow() {
     )
     
     validating.value = true
-    const response = await schedulerAPI.validateNow()
+    const response = await schedulerService.validateNow()
     if (response.code === 200) {
       ElMessage.success('全量验证已启动，请在日志中查看进度')
     } else {
@@ -333,7 +334,7 @@ async function handleSave() {
   
   saving.value = true
   try {
-    const response = await settingsAPI.saveSettings(settings)
+    const response = await settingService.saveSettings(settings)
     
     if (response.code === 200) {
       ElMessage.success('配置保存成功')