feat(provider): 增加 Claude Code 适配器、高级配置能力与 OAuth 账号类型统一解析

- 新增 Claude Code provider adapter (context, envelope, plugin, constants)
- 扩展 provider admin 路由，支持 Claude Code 高级配置 (CRUD)
- 统一 OAuth 账号类型解析逻辑，前后端对齐
- 重构 BatchAssignModelsDialog / ModelMappingDialog，简化组件逻辑
- handler 基类增强: request_builder 支持 Claude Code 信封格式
- CLI stream/sync mixin 适配 Claude Code 流式与同步模式
- 扩展 candidate builder / failover / scheduler 对 Claude Code 的支持
- 前端增加请求时间线可视化 (HorizontalRequestTimeline)
- 补充 Claude Code envelope / runtime controls / distributed sessions 等测试

Closes #183
Closes #185

Co-Authored-By: AAEE86 <ppk0227@hotmail.com>

frontend/src/features/usage/components/HorizontalRequestTimeline.vue

@@ -252,6 +252,62 @@
                       </span>
                     </span>
                   </div>
+                  <div
+                    v-if="currentAttempt.extra_data?.pool_selection"
+                    class="info-item"
+                  >
+                    <span class="info-label">号池调度</span>
+                    <span class="info-value info-value-stacked">
+                      <span class="pool-reason">
+                        <span
+                          class="pool-reason-tag"
+                          :class="'pool-' + currentAttempt.extra_data.pool_selection.reason"
+                        >
+                          {{ poolSelectionLabel(currentAttempt.extra_data.pool_selection.reason) }}
+                        </span>
+                        <span
+                          v-if="currentAttempt.extra_data.pool_selection.cost_soft_threshold"
+                          class="pool-cost-warn"
+                        >接近限额</span>
+                      </span>
+                      <span
+                        v-if="currentAttempt.extra_data.pool_selection.cost_window_usage"
+                        class="text-xs text-muted-foreground"
+                      >
+                        {{ formatNumber(currentAttempt.extra_data.pool_selection.cost_window_usage) }}
+                        <template v-if="currentAttempt.extra_data.pool_selection.cost_limit">
+                          / {{ formatNumber(currentAttempt.extra_data.pool_selection.cost_limit) }}
+                        </template>
+                        tokens
+                      </span>
+                    </span>
+                  </div>
+                  <div
+                    v-if="currentAttempt.extra_data?.pool_skip"
+                    class="info-item"
+                  >
+                    <span class="info-label">号池跳过</span>
+                    <span class="info-value info-value-stacked">
+                      <span class="pool-skip-type">
+                        {{ poolSkipLabel(currentAttempt.extra_data.pool_skip.type) }}
+                      </span>
+                      <span
+                        v-if="currentAttempt.extra_data.pool_skip.cooldown_reason"
+                        class="text-xs text-muted-foreground"
+                      >
+                        {{ currentAttempt.extra_data.pool_skip.cooldown_reason }}
+                        <template v-if="currentAttempt.extra_data.pool_skip.cooldown_ttl != null">
+                          ({{ currentAttempt.extra_data.pool_skip.cooldown_ttl }}s)
+                        </template>
+                      </span>
+                      <span
+                        v-if="currentAttempt.extra_data.pool_skip.cost_window_usage"
+                        class="text-xs text-muted-foreground"
+                      >
+                        {{ formatNumber(currentAttempt.extra_data.pool_skip.cost_window_usage) }} tokens
+                      </span>
+                    </span>
+                  </div>
                   <div
                     v-if="mergedCapabilities.length > 0"
                     class="info-item"
@@ -764,6 +820,25 @@ const formatCapabilityLabel = (cap: string): string => {
   return labels[cap] || cap
 }
 
+const poolSelectionLabel = (reason: string): string => {
+  const labels: Record<string, string> = {
+    sticky: '粘性会话',
+    lru: 'LRU',
+    random: '随机',
+    tiebreak: '随机 (平分)',
+  }
+  return labels[reason] || reason
+}
+
+const poolSkipLabel = (type: string): string => {
+  const labels: Record<string, string> = {
+    cooldown: '冷却中',
+    cost_exhausted: '额度耗尽',
+    upstream: '上游跳过',
+  }
+  return labels[type] || type
+}
+
 // 检查组是否被悬浮
 const isGroupHovered = (groupIndex: number) => {
   return hoveredGroupIndex.value === groupIndex
@@ -1485,6 +1560,52 @@ const getStatusColorClass = (status: string) => {
   gap: 0.375rem;
 }
 
+/* 号池调度 */
+.pool-reason {
+  display: flex;
+  align-items: center;
+  gap: 0.375rem;
+}
+
+.pool-reason-tag {
+  display: inline-flex;
+  align-items: center;
+  padding: 0.15rem 0.5rem;
+  font-size: 0.7rem;
+  font-weight: 500;
+  border-radius: 4px;
+  white-space: nowrap;
+  border: 1px solid hsl(var(--border));
+}
+
+.pool-reason-tag.pool-sticky {
+  color: hsl(var(--chart-4));
+  border-color: hsl(var(--chart-4) / 0.3);
+  background: hsl(var(--chart-4) / 0.08);
+}
+
+.pool-reason-tag.pool-lru {
+  color: hsl(var(--chart-2));
+  border-color: hsl(var(--chart-2) / 0.3);
+  background: hsl(var(--chart-2) / 0.08);
+}
+
+.pool-reason-tag.pool-random,
+.pool-reason-tag.pool-tiebreak {
+  color: hsl(var(--muted-foreground));
+}
+
+.pool-cost-warn {
+  font-size: 0.65rem;
+  color: hsl(var(--chart-5));
+  font-weight: 500;
+}
+
+.pool-skip-type {
+  font-weight: 500;
+  color: hsl(var(--muted-foreground));
+}
+
 /* 能力标签 */
 .capability-tags {
   display: flex;

frontend/src/features/usage/components/RequestDetailDrawer.vue

@@ -370,6 +370,51 @@
                 </div>
               </Card>
 
+              <!-- 号池调度摘要 -->
+              <Card v-if="poolSummary">
+                <div class="p-3 sm:p-4">
+                  <div class="text-xs text-muted-foreground mb-2 font-medium">
+                    号池调度
+                  </div>
+                  <div class="flex items-center gap-3 flex-wrap text-sm">
+                    <span class="font-mono">
+                      {{ poolSummary.total_keys }} 候选
+                    </span>
+                    <span class="text-muted-foreground">|</span>
+                    <span class="font-mono">
+                      {{ poolSummary.attempted }} 尝试
+                    </span>
+                    <template v-if="poolSummary.skipped_cooldown > 0">
+                      <span class="text-muted-foreground">|</span>
+                      <span class="font-mono text-amber-600 dark:text-amber-400">
+                        {{ poolSummary.skipped_cooldown }} 冷却跳过
+                      </span>
+                    </template>
+                    <template v-if="poolSummary.skipped_cost > 0">
+                      <span class="text-muted-foreground">|</span>
+                      <span class="font-mono text-orange-600 dark:text-orange-400">
+                        {{ poolSummary.skipped_cost }} 成本跳过
+                      </span>
+                    </template>
+                    <template v-if="poolSummary.sticky_session">
+                      <span class="text-muted-foreground">|</span>
+                      <Badge
+                        variant="outline"
+                        class="text-[10px] px-1.5 py-0 h-4"
+                      >
+                        粘性会话
+                      </Badge>
+                    </template>
+                    <template v-if="poolSummary.success_reason">
+                      <span class="text-muted-foreground">|</span>
+                      <span class="text-xs text-muted-foreground">
+                        {{ poolSummary.success_reason }}
+                      </span>
+                    </template>
+                  </div>
+                </div>
+              </Card>
+
               <!-- 请求链路追踪卡片 -->
               <div v-if="detail.request_id || detail.id">
                 <HorizontalRequestTimeline
@@ -733,6 +778,13 @@ const isDark = computed(() => {
   return document.documentElement.classList.contains('dark')
 })
 
+// 号池调度摘要
+const poolSummary = computed(() => {
+  const ps = detail.value?.metadata?.pool_summary as Record<string, unknown> | undefined
+  if (!ps || !ps.enabled) return null
+  return ps
+})
+
 // 检测是否有提供商请求头
 const hasProviderHeaders = computed(() => {
   return !!(detail.value?.provider_request_headers &&