feat: Add LLM call timeout configuration to agent frontend

- Add llm_call_timeout field to CustomAgentConfig TypeScript interface
- Add thinking field to CustomAgentConfig (for extended thinking support)
- Add UI control (number input) in AgentEditorModal for timeout configuration
  - Range: 0-600 seconds (0 = use global default)
  - Supports 60-600 seconds recommended range
- Add i18n translations in Chinese (zh-CN) and English (en-US)
  - Label: "LLM 调用超时" / "LLM Call Timeout"
  - Description with explanation of timeout behavior
  - Hint about default and unlimited wait implications
  - Placeholder with recommended range
- Initialize llm_call_timeout: 0 in formData (uses global default)

This completes the frontend support for per-agent LLM timeout configuration that was previously missing. The setting integrates with the existing three-tier configuration hierarchy:
1. Per-agent config (llm_call_timeout in custom_agents table)
2. Global config (agent.llm_call_timeout in config.yaml)
3. Hardcoded default (120 seconds)

frontend/src/api/agent/index.ts

@@ -23,9 +23,11 @@ export interface CustomAgentConfig {
   rerank_model_id?: string;         // ReRank 模型 ID
   temperature?: number;
   max_completion_tokens?: number;   // 最大生成token数（普通模式）
+  thinking?: boolean;                      // 是否启用思考模式（支持扩展思考的模型）
 
   // ===== Agent模式设置 =====
   max_iterations?: number;          // 最大迭代次数
+  llm_call_timeout?: number;        // LLM调用超时时间（秒）
   allowed_tools?: string[];         // 允许的工具
   reflection_enabled?: boolean;     // 是否启用反思
   // MCP服务选择模式：all=全部启用的MCP服务, selected=指定服务, none=不使用MCP

frontend/src/i18n/locales/en-US.ts

@@ -3664,6 +3664,12 @@ export default {
       selectDesc: 'Select MCP services to enable',
       selectPlaceholder: 'Select MCP services',
     },
+    llmCallTimeout: {
+      label: "LLM Call Timeout",
+      desc: "Maximum waiting time for a single LLM call (seconds). Call will be terminated if this time is exceeded",
+      hint: "0 means unlimited wait (not recommended)",
+      placeholder: "Enter seconds, recommended range 60-600",
+    },
     imageUpload: {
       navLabel: 'Multimodal',
       sectionTitle: 'Multimodal Configuration',

frontend/src/i18n/locales/zh-CN.ts

@@ -3662,6 +3662,12 @@ export default {
       selectDesc: "选择要启用的 MCP 服务",
       selectPlaceholder: "选择 MCP 服务",
     },
+    llmCallTimeout: {
+      label: "LLM 调用超时",
+      desc: "单次 LLM 调用的最大等待时间（秒），超过此时间后调用将被中止",
+      hint: "0 表示无限等待（不推荐）",
+      placeholder: "输入秒数，建议范围 60-600",
+    },
     imageUpload: {
       navLabel: "多模态",
       sectionTitle: "多模态配置",

frontend/src/views/agent/AgentEditorModal.vue

@@ -748,6 +748,25 @@
                       </div>
                     </div>
 
+                    <!-- LLM 调用超时时间 -->
+                    <div class="setting-row">
+                      <div class="setting-info">
+                        <label>{{ $t('agentEditor.llmCallTimeout.label') }}</label>
+                        <p class="desc">{{ $t('agentEditor.llmCallTimeout.desc') }}</p>
+                        <p class="desc-hint">{{ $t('agentEditor.llmCallTimeout.hint') }}</p>
+                      </div>
+                      <div class="setting-control">
+                        <t-input-number 
+                          v-model="formData.config.llm_call_timeout" 
+                          :min="0" 
+                          :max="600" 
+                          theme="column"
+                          :placeholder="$t('agentEditor.llmCallTimeout.placeholder')"
+                          clearable
+                        />
+                      </div>
+                    </div>
+
                     <!-- MCP 服务选择 -->
                     <div class="setting-row">
                       <div class="setting-info">
@@ -1797,6 +1816,7 @@ const defaultFormData = {
     thinking: false, // 默认禁用思考模式
     // Agent模式设置
     max_iterations: 10,
+    llm_call_timeout: 120,  // 120 seconds
     allowed_tools: [] as string[],
     reflection_enabled: false,
     // MCP 服务设置