渠道支持多 API 格式 + 协议全名展示

- Channel 新增 formats(jsonb: chat|responses|messages), 一个渠道可同时声明
  支持 OpenAI Chat Completions / OpenAI Responses API / Anthropic Messages
- 路由改为按渠道声明的 formats 决定直通/转换: 客户端协议在 formats 内直通,
  否则转换为其首选支持格式(chat > messages > responses)
- 兼容旧数据: formats 为空时按 provider 推断(openai→chat+responses, anthropic→messages, compatible→chat)
- 前端: 渠道表/表单展示 API 格式(支持多选), usage 明细显示协议全名
  (OpenAI Chat Completions / OpenAI Responses API / Anthropic Messages)

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

web/src/views/console/UsageView.vue

@@ -3,6 +3,7 @@ import { onMounted, ref } from 'vue'
 import { http, errMsg } from '@/api/client'
 import { useToastStore } from '@/stores/toast'
 import { fmtNum, fmtCost, fmtTime } from '@/lib/format'
+import { protocolName } from '@/lib/protocol'
 import Badge from '@/components/ui/Badge.vue'
 import TrendChart from '@/components/ui/TrendChart.vue'
 import type { UsageLog } from '@/types'
@@ -122,7 +123,7 @@ onMounted(load)
           <tbody>
             <tr v-for="l in logs" :key="l.id" class="table-row">
               <td class="px-4 py-2.5 font-mono text-xs text-ink">{{ l.model }}</td>
-              <td class="px-4 py-2.5 font-mono text-xs text-muted">{{ l.protocol }}</td>
+              <td class="px-4 py-2.5 font-mono text-xs text-muted">{{ protocolName(l.protocol) }}</td>
               <td class="px-4 py-2.5 mono-num text-xs text-muted">{{ l.input_tokens }}/{{ l.output_tokens }}</td>
               <td class="px-4 py-2.5 mono-num text-xs text-ink">{{ fmtCost(l.cost) }}</td>
               <td class="px-4 py-2.5 mono-num text-xs text-muted">{{ l.latency_ms }}ms</td>