前端: Base URL 输入限长 + 列表截断防撑破

- Input 组件支持 maxlength 透传
- 渠道表单 4 个 Base URL 输入框限 255 字符
- 渠道列表 Base URL 单元格截断显示（max-w-220px）

Co-Authored-By: Claude <noreply@anthropic.com>

web/src/components/ui/Input.vue

@@ -9,6 +9,7 @@ withDefaults(
     error?: string
     autocomplete?: string
     disabled?: boolean
+    maxlength?: number
   }>(),
   { type: 'text', modelValue: '', disabled: false },
 )
@@ -24,6 +25,7 @@ const emit = defineEmits<{ 'update:modelValue': [string | number] }>()
       :placeholder="placeholder"
       :autocomplete="autocomplete"
       :disabled="disabled"
+      :maxlength="maxlength"
       class="h-10 w-full rounded-md border border-edge2 bg-surface px-3 text-sm text-ink placeholder-muted outline-none transition focus:border-accent focus:ring-2 focus:ring-accent disabled:cursor-not-allowed disabled:opacity-50"
       :class="error && 'border-err focus:border-err focus:ring-err'"
       @input="emit('update:modelValue', ($event.target as HTMLInputElement).value as string | number)"

web/src/views/admin/ChannelsView.vue

@@ -222,7 +222,7 @@ onMounted(load)
                   >{{ protocolShort(f) }}</code>
                 </div>
               </td>
-              <td class="px-4 py-2.5 font-mono text-xs text-muted">{{ ch.base_url }}</td>
+              <td class="max-w-[220px] truncate px-4 py-2.5 font-mono text-xs text-muted">{{ ch.base_url }}</td>
               <td class="px-4 py-2.5 font-mono text-xs text-muted">{{ ch.api_key_masked || '****' }}</td>
               <td class="px-4 py-2.5">
                 <Badge :variant="ch.health_status === 'healthy' ? 'ok' : ch.health_status === 'cooldown' ? 'err' : 'warn'">
@@ -288,13 +288,14 @@ onMounted(load)
           v-model="form.base_url"
           label="Base URL（可选）"
           placeholder="https://api.openai.com/v1"
+          :maxlength="255"
           hint="支持前缀或完整端点，如 https://api.openai.com/v1 或 https://api.openai.com/v1/chat/completions；留空按供应商默认"
         />
         <div class="space-y-3 rounded-md border border-edge p-3">
           <p class="text-xs font-medium text-muted">分协议 Base URL（可选，如智谱三种格式不同）</p>
-          <Input v-model="form.base_urls.chat" label="OpenAI Chat Completions" placeholder="留空用主 Base URL" />
-          <Input v-model="form.base_urls.responses" label="OpenAI Responses" placeholder="留空用主 Base URL" />
-          <Input v-model="form.base_urls.messages" label="Anthropic Messages" placeholder="留空用主 Base URL" />
+          <Input v-model="form.base_urls.chat" label="OpenAI Chat Completions" placeholder="留空用主 Base URL" :maxlength="255" />
+          <Input v-model="form.base_urls.responses" label="OpenAI Responses" placeholder="留空用主 Base URL" :maxlength="255" />
+          <Input v-model="form.base_urls.messages" label="Anthropic Messages" placeholder="留空用主 Base URL" :maxlength="255" />
           <p class="text-xs text-muted">网关按协议选对应 base_url 直通，无需为每种格式建多个渠道</p>
         </div>
         <Input