feat(platform): 模型可用性 - 目录附带近24小时成功率与7天趋势

公开目录只统计系统渠道的 create 成败，样本不足或日志不可用时不改变现有可用判断；模型选择器展示当前可用状态和历史成功率。

web/src/stores/use-config-store.ts

@@ -8,7 +8,7 @@ import { modelProtocolCapability, normalizeModelProtocol, type ModelProtocol } f
 import { normalizeVideoDuration, normalizeVideoResolution } from "@/lib/video-generation-options";
 import { type ModelCapabilityConfig } from "@/lib/model-capabilities";
 import { useUserStore } from "@/stores/use-user-store";
-import type { CapabilitySpec, PublicLogicalModelPriceTier } from "@/services/api/logical-models";
+import type { CapabilitySpec, PublicChannelModelAvailability, PublicLogicalModelPriceTier } from "@/services/api/logical-models";
 import { type WorkflowFieldMapping, normalizeRunningHubCapability, normalizeRunningHubWorkflowKind, normalizeSavedWorkflowFields, mergeWorkflowFieldMappings, normalizeWorkflowFieldMappings } from "./config-workflow-fields";
 import {
     decodeChannelModel,
@@ -109,6 +109,8 @@ export type ModelChannel = {
         logicalCapabilityProfiles?: CapabilitySpec[];
         logicalPriceTiers?: PublicLogicalModelPriceTier[];
         defaultOptions?: Record<string, unknown>;
+        availability?: PublicChannelModelAvailability;
+        available?: boolean;
     }>;
 };