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/views/ai/agents/AgentDesigner.vue

@@ -38,6 +38,7 @@ import AgentStudioCanvas from './components/agent-studio/AgentStudioCanvas.vue';
 import AgentCommandBar from './components/AgentCommandBar.vue';
 import AgentInspectorPanel from './components/AgentInspectorPanel.vue';
 import { useAgentDesignerState } from './composables/useAgentDesignerState';
+import { resolveAgentCompressionTokenThreshold } from './compression-threshold';
 import { createMcpToolLoader } from './mcpToolLoader';
 
 const route = useRoute();
@@ -385,8 +386,25 @@ function runValidation() {
   return true;
 }
 
+function syncAgentCompressionThreshold() {
+  const selectedModel = models.value.find(
+    (model) => model.value === String(state.agent.modelId ?? ''),
+  );
+  const memoryConfig = (state.agent.memoryConfigJson ||= {});
+  const compressionParameter = (memoryConfig.compressionParameter ||= {});
+  compressionParameter.minCompressionTokenThreshold =
+    resolveAgentCompressionTokenThreshold({
+      contextWindowTokens: selectedModel?.raw?.contextWindowTokens,
+      generationConfig: state.agent.generationConfigJson,
+      maxOutputTokens: selectedModel?.raw?.maxOutputTokens,
+      systemPrompt: state.agent.promptConfigJson?.systemPrompt,
+      toolBindings: state.toolBindings,
+    });
+}
+
 async function handleSave(showMessage = true) {
   if (!runValidation()) return false;
+  syncAgentCompressionThreshold();
   saveLoading.value = true;
   try {
     const agentPayload = buildPayloadAgent();
@@ -497,6 +515,7 @@ async function handleOffline() {
 
 function handleTryout() {
   if (!runValidation()) return;
+  syncAgentCompressionThreshold();
   openTryout();
 }