feat: 按模型上下文自动配置智能体压缩阈值

- 从 llm.json 解析上下文与输出上限，并增强短模型 ID 匹配

- 切换模型、保存和试运行时按预算公式重算，目录缺失时回退 30K

- 修复模型列表接口未返回能力元数据

easyflow-ui-admin/app/src/api/ai/llm.ts

@@ -43,6 +43,8 @@ export interface ModelCapabilityResolution {
   detected: boolean;
   modelType: 'chatModel' | 'embeddingModel' | 'rerankModel';
   source: ModelCapabilitySource;
+  contextWindowTokens?: null | number;
+  maxOutputTokens?: null | number;
   supportImage?: boolean | null;
   supportThinking?: boolean | null;
   supportTool?: boolean | null;
@@ -141,6 +143,8 @@ export interface llmType {
   providerId?: string;
   title: string;
   modelName?: string;
+  contextWindowTokens?: null | number;
+  maxOutputTokens?: null | number;
   modelProvider: {
     icon: string;
     providerName: string;