fix: 修复路由竞态、删除确认、输入同步等交互问题

- router.js 添加竞态防护和页面清理钩子
- logs.js 切换 Tab 时清空搜索框
- models.js 删除 Provider 添加确认提示，输入框改 oninput 实时同步
- mcp.js 删除 Server 添加确认提示
- gateway.js Tailscale 地址为空时保留原配置

src/pages/gateway.js

@@ -107,7 +107,7 @@ async function saveConfig(page, state) {
   state.config.gateway = {
     ...state.config.gateway,
     port, bind, mode, authToken,
-    tailscale: tailscaleAddr ? { address: tailscaleAddr } : undefined,
+    tailscale: tailscaleAddr ? { address: tailscaleAddr } : (state.config.gateway?.tailscale || undefined),
   }
 
   try {

src/pages/logs.js

@@ -42,6 +42,7 @@ export async function render() {
       page.querySelectorAll('.tab').forEach(t => t.classList.remove('active'))
       tab.classList.add('active')
       currentTab = tab.dataset.tab
+      page.querySelector('#log-search').value = ''
       loadLog(page, currentTab)
     }
   })

src/pages/mcp.js

@@ -76,6 +76,7 @@ function renderServers(page, state) {
       const action = btn.dataset.action
 
       if (action === 'delete') {
+        if (!confirm(`确定删除 MCP Server "${key}"？`)) return
         if (state.config.mcpServers) delete state.config.mcpServers[key]
         else delete state.config[key]
         renderServers(page, state)

src/pages/models.js

@@ -102,6 +102,7 @@ function renderProviders(page, state) {
         const models = section.querySelector('.provider-models')
         models.style.display = models.style.display === 'none' ? 'block' : 'none'
       } else if (action === 'delete-provider') {
+        if (!confirm(`确定删除 Provider "${providerKey}"？`)) return
         delete state.config.models.providers[providerKey]
         renderProviders(page, state)
         toast(`已删除 ${providerKey}`, 'info')
@@ -124,9 +125,9 @@ function renderProviders(page, state) {
     }
   })
 
-  // 输入框变更同步到 state
+  // 输入框变更实时同步到 state
   listEl.querySelectorAll('[data-field]').forEach(input => {
-    input.onchange = () => {
+    input.oninput = () => {
       const providerKey = input.closest('[data-provider]').dataset.provider
       state.config.models.providers[providerKey][input.dataset.field] = input.value
     }