refactor: 页面配置UI改为下拉添加模式，每个类型只能添加一次

1. +添加按钮改为下拉选择可用页面类型，已添加的自动隐藏
2. 每个条目的key改为固定tag显示，不可再通过下拉修改
3. URL placeholder 去掉{base}，直接用相对路径
4. resolveUrl 改为自动拼接站点baseUrl

web/src/views/SitePages.vue

@@ -89,14 +89,22 @@
         <!-- 页面入口 -->
         <div style="font-size:13px;font-weight:500;margin-bottom:8px;display:flex;justify-content:space-between;align-items:center">
           <span>页面入口</span>
-          <el-button size="small" @click="addEntry">+ 添加</el-button>
+          <el-dropdown v-if="availableKeys.length" @command="addEntryByKey">
+            <el-button size="small" type="primary">+ 添加</el-button>
+            <template #dropdown>
+              <el-dropdown-menu>
+                <el-dropdown-item v-for="k in availableKeys" :key="k.key" :command="k">
+                  {{ k.key }} - {{ k.label }}
+                </el-dropdown-item>
+              </el-dropdown-menu>
+            </template>
+          </el-dropdown>
+          <el-button v-else size="small" disabled>已全部添加</el-button>
         </div>
         <div v-if="!parsed.length" style="text-align:center;padding:40px;color:#909399">暂无，点击添加</div>
         <div v-for="(entry, idx) in parsed" :key="idx" style="margin-bottom:12px;padding:12px;border:1px solid #ebeef5;border-radius:4px;background:#fafafa">
           <div style="display:flex;gap:8px;align-items:center;margin-bottom:8px">
-            <el-select v-model="entry.key" size="small" @change="onKeyChange(entry)" filterable style="width:140px" placeholder="选择操作">
-              <el-option v-for="k in pageKeys" :key="k.key" :label="k.key+' - '+k.label" :value="k.key" />
-            </el-select>
+            <el-tag size="small" type="primary">{{ entry.key }} - {{ keyLabel(entry.key) }}</el-tag>
             <el-select v-model="entry.method" size="small" @change="syncToJson" style="width:80px">
               <el-option label="GET" value="GET"/><el-option label="POST" value="POST"/>
             </el-select>
@@ -104,7 +112,7 @@
             <el-button size="small" type="danger" text @click="remove(idx)">删除</el-button>
           </div>
           <div style="display:flex;gap:8px;align-items:flex-start;margin-bottom:6px;max-width:500px">
-            <el-input v-model="entry.url" size="small" placeholder="URL模板，支持{base}{keyword}{page}{id}{passkey}" @input="syncToJson" style="flex:1" />
+            <el-input v-model="entry.url" size="small" placeholder="URL路径，如 /torrents.php" @input="syncToJson" style="flex:1" />
             <el-button size="small" @click="verifyEntry(entry, idx)" :loading="verifying[idx]" :type="verifyResults[idx]?.success===true ? 'success' : verifyResults[idx]?.success===false ? 'danger' : ''">
               {{ verifyResults[idx]?.success===true ? '✓' : verifyResults[idx]?.success===false ? '✗' : '验证' }}
             </el-button>
@@ -146,6 +154,12 @@ const loadPageKeys = async () => {
   catch {}
 }
 
+const keyLabel = (key) => pageKeys.value.find(k => k.key === key)?.label || key
+const availableKeys = computed(() => {
+  const used = new Set(parsed.value.map(e => e.key).filter(Boolean))
+  return pageKeys.value.filter(k => !used.has(k.key))
+})
+
 const onKeyChange = (row) => {
   const pk = pageKeys.value.find(k => k.key === row.key)
   if (pk?.defaultMethod) row.method = pk.defaultMethod
@@ -163,12 +177,16 @@ const syncToJson = () => {
   const obj = { authType: authType.value, entries: parsed.value }
   editorJson.value = JSON.stringify(obj, null, 2)
 }
-const resolveUrl = (url) => url?.replace('{base}', sitesList.value.find(s=>s.siteId===editSiteId.value)?.urls?.[0] || '{base}') || ''
+const resolveUrl = (url) => {
+  const base = sitesList.value.find(s=>s.siteId===editSiteId.value)?.urls?.[0] || ''
+  if (!url || !base) return url || ''
+  return url.startsWith('/') ? base.replace(/\/$/, '') + url : url
+}
 
 const verifyEntry = async (entry, idx) => {
   const resolved = resolveUrl(entry.url)
   if (!resolved || resolved === entry.url) {
-    ElMessage.warning('请先配置站点地址，URL中需包含 {base} 占位符')
+    ElMessage.warning('请先配置站点地址')
     return
   }
   verifying.value = { ...verifying.value, [idx]: true }
@@ -276,7 +294,10 @@ const discardDraft = async () => {
 }
 
 const remove = (idx) => { parsed.value.splice(idx,1); syncToJson() }
-const addEntry = () => { parsed.value.push({key:'',method:'GET',url:'{base}'}); syncToJson() }
+const addEntryByKey = (k) => {
+  parsed.value.push({ key: k.key, method: k.defaultMethod || 'GET', url: '' })
+  syncToJson()
+}
 const deletePages = async () => {
   try { await ElMessageBox.confirm('删除后站点将使用默认模板','确认',{type:'warning',confirmButtonText:'确认删除'}) } catch { return }
   deleting.value = true