新增: 自动升级体系 + WorkerW重建检测 + 知识卡片优化

自动升级:
- 版本变量注入 (-ldflags -X main.version)
- 远程 version.json 检查 + 弹窗提示(非强制右下角/强制居中)
- updater.exe 嵌入主程序, 运行时释放到临时目录
- 下载+SHA256校验+备份+替换+回滚 全流程
- 托盘菜单"检查更新"

稳定性:
- WorkerW 重建自动检测(每10s)并重新嵌入
- 左键托盘点击防抖
- 设置窗口已打开时正确前置

优化:
- 知识卡片prompt改为面向开发者的硬核内容
- 配置目录统一到 ~/.u-desktop/
- 设置窗口WebView2数据目录改为configDir下

web-ui/src/settings/components/PersonalizeSection.vue

@@ -11,13 +11,13 @@
       </div>
       <div class="flex justify-between items-center px-3.5 py-2 border-t border-[var(--card-divider)]">
         <div><div class="text-xs font-medium text-[var(--text-muted)]">知识关键字</div><div class="text-[10px] text-[var(--text-weak)] mt-px">AI 将根据关键字生成知识小卡片</div></div>
-        <input type="text" v-model="s.knowledgeKeyword" @input="debounced(go.saveKnowledgeKeyword, s.knowledgeKeyword)"
+        <input type="text" v-model="s.knowledgeKeyword" @input="debounced('kw', go.saveKnowledgeKeyword, s.knowledgeKeyword)"
           placeholder="如: 历史、科学、冷知识"
           class="bg-[var(--input-bg)] border border-[var(--input-border)] rounded-md text-[var(--text)] text-[11px] py-1 px-2 outline-none w-[140px] focus:border-[var(--input-border-focus)]">
       </div>
       <div class="flex justify-between items-center px-3.5 py-2 border-t border-[var(--card-divider)]">
         <div><div class="text-xs font-medium text-[var(--text-muted)]">知识提示词</div><div class="text-[10px] text-[var(--text-weak)] mt-px">补充风格或方向，系统会保证内容密度</div></div>
-        <input type="text" v-model="s.knowledgePrompt" @input="debounced(go.saveKnowledgePrompt, s.knowledgePrompt)"
+        <input type="text" v-model="s.knowledgePrompt" @input="debounced('kp', go.saveKnowledgePrompt, s.knowledgePrompt)"
           placeholder="如: 偏实践、给出判断标准"
           class="bg-[var(--input-bg)] border border-[var(--input-border)] rounded-md text-[var(--text)] text-[11px] py-1 px-2 outline-none w-[140px] focus:border-[var(--input-border-focus)]">
       </div>
@@ -76,12 +76,10 @@ function onDocClick(e: MouseEvent) {
 
 onMounted(() => {
   document.addEventListener('click', onDocClick)
-  // Find initial city
-  for (const p of Object.keys(props.s.citiesByProv)) {
-    for (const c of (props.s.citiesByProv as any)[p]) {
-      if (c.id === props.s.city) { activeProv.value = p; selectedCityName.value = c.name; break }
-    }
-    if (activeProv.value) break
+  const entries = Object.entries(props.s.citiesByProv as Record<string, { id: string; name: string }[]>)
+  for (const [p, cs] of entries) {
+    const found = cs.find(c => c.id === props.s.city)
+    if (found) { activeProv.value = p; selectedCityName.value = found.name; break }
   }
 })
 onUnmounted(() => document.removeEventListener('click', onDocClick))

web-ui/src/settings/components/PhotoSection.vue

@@ -29,12 +29,20 @@
 </template>
 
 <script setup lang="ts">
+import { watch } from 'vue'
 import { go } from '../composables/useGoBridge'
 import ToggleSwitch from './ToggleSwitch.vue'
 import type { SettingsData } from '@shared/types'
 
 const props = defineProps<{ s: SettingsData }>()
 
+watch(
+  () => [props.s.photoCard, props.s.photoFrameMode] as [boolean, boolean],
+  ([photoCard, photoFrameMode]) => {
+    go.saveToggles({ photoCard, photoFrameMode })
+  }
+)
+
 async function onPickDir() {
   const dir = await go.pickPhotoDir()
   if (dir) props.s.photoDir = dir

web-ui/src/settings/components/WallpaperSection.vue

@@ -26,7 +26,7 @@
       </div>
       <div v-if="s.theme === 'text'" class="flex justify-between items-center px-3.5 py-2 border-t border-[var(--card-divider)]">
         <div class="text-xs font-medium text-[var(--text-muted)]">自定义文字</div>
-        <input type="text" v-model="s.wallpaperText" @input="debounced(go.saveWallpaperText, s.wallpaperText)"
+        <input type="text" v-model="s.wallpaperText" @input="debounced('wt', go.saveWallpaperText, s.wallpaperText)"
           placeholder="输入显示文字"
           class="bg-[var(--input-bg)] border border-[var(--input-border)] rounded-md text-[var(--text)] text-[11px] py-1 px-2 outline-none w-[140px] focus:border-[var(--input-border-focus)]">
       </div>
@@ -135,7 +135,10 @@ async function loadBingInfo() {
   const raw = await go.getBingInfo()
   const st = JSON.parse(raw) as BingState
   bing.value = st
-  if (st.url) bingThumb.value = st.url.replace('_1920x1080', '_400x240')
+  if (st.url) {
+    const t = st.url.replace('_1920x1080', '_400x240')
+    bingThumb.value = t !== st.url ? t : await go.bingThumbDataURI(st.url.split('/').pop() || '')
+  }
 }
 
 async function onBingPrev() { bing.value = JSON.parse(await go.bingPrev()) }

web-ui/src/settings/composables/useDebounce.ts

@@ -1,5 +1,5 @@
 const timers = new Map<string, ReturnType<typeof setTimeout>>()
-export function debounced(fn: (v: string) => void, val: string, ms = 500) {
-  clearTimeout(timers.get(fn.name))
-  timers.set(fn.name, setTimeout(() => fn(val), ms))
+export function debounced(key: string, fn: (v: string) => void, val: string, ms = 500) {
+  clearTimeout(timers.get(key))
+  timers.set(key, setTimeout(() => fn(val), ms))
 }