feat: update architecture documentation with new system components and reorganize learning paths

Rearranged the StartHere page content to reflect updated system architecture including Hook system, Policy engine, Message bus, and Model routing components. Updated developer and explorer learning paths to include Agent framework, improved animation explanations, and added new terminology definitions for Agent and other core concepts. This restructuring better aligns the documentation with current system design patterns and provides clearer learning pathways for developers.

Author: tt-a1i

src/pages/StartHere.tsx

@@ -28,11 +28,11 @@ export function StartHere({ onNavigate }: StartHereProps) {
       description: '理解整体架构设计、设计模式和系统边界',
       steps: [
         { id: 'overview', label: '架构概览', desc: '整体架构鸟瞰' },
-        { id: 'lifecycle', label: '请求生命周期', desc: '端到端流程' },
-        { id: 'multi-provider', label: '多厂商架构', desc: 'Provider 抽象' },
-        { id: 'tool-arch', label: '工具架构', desc: '工具系统设计' },
+        { id: 'hook-system', label: 'Hook 系统', desc: '事件拦截机制' },
+        { id: 'policy-engine', label: 'Policy 引擎', desc: '安全策略决策' },
+        { id: 'message-bus', label: '消息总线', desc: '发布/订阅通信' },
+        { id: 'model-routing', label: '模型路由', desc: 'Flash/Pro 选择' },
         { id: 'design-tradeoffs', label: '设计权衡', desc: '架构决策分析' },
-        { id: 'error-recovery-patterns', label: '错误恢复', desc: '容错设计' },
       ],
     },
     developer: {
@@ -43,10 +43,10 @@ export function StartHere({ onNavigate }: StartHereProps) {
       steps: [
         { id: 'startup-chain', label: '启动链路', desc: '入口点分析' },
         { id: 'tool-ref', label: '工具参考', desc: '内置工具列表' },
-        { id: 'custom-cmd', label: '自定义命令', desc: '扩展命令系统' },
+        { id: 'agent-framework', label: 'Agent 框架', desc: '子代理开发' },
         { id: 'extension', label: '扩展系统', desc: '插件开发' },
-        { id: 'zed-integration', label: 'IDE 集成', desc: 'Zed ACP 协议' },
         { id: 'mcp', label: 'MCP集成', desc: '扩展协议' },
+        { id: 'zed-integration', label: 'IDE 集成', desc: 'Zed ACP 协议' },
       ],
     },
     explorer: {
@@ -57,11 +57,11 @@ export function StartHere({ onNavigate }: StartHereProps) {
       steps: [
         { id: 'gemini-chat', label: '核心循环', desc: 'GeminiChat 详解' },
         { id: 'interaction-loop', label: '交互循环', desc: 'Turn 状态机' },
-        { id: 'streaming-response-processing', label: '流式响应', desc: 'Chunk 解析' },
-        { id: 'content-format-conversion', label: '格式转换', desc: 'OpenAI/Gemini' },
-        { id: 'concurrency-patterns', label: '并发模式', desc: '资源控制' },
-        { id: 'loop-detect', label: '循环检测', desc: '防护机制' },
-        { id: 'animation', label: '动画演示', desc: '可视化流程' },
+        { id: 'routing-chain-anim', label: '路由策略链', desc: '模型选择动画' },
+        { id: 'agent-loop-anim', label: 'Agent 循环', desc: '子代理执行动画' },
+        { id: 'hook-event-anim', label: 'Hook 事件流', desc: '事件拦截动画' },
+        { id: 'policy-decision-anim', label: 'Policy 决策', desc: '安全决策动画' },
+        { id: 'animation', label: '更多动画', desc: '可视化流程' },
       ],
     },
   };
@@ -73,6 +73,7 @@ export function StartHere({ onNavigate }: StartHereProps) {
     { term: 'Policy', definition: '安全策略引擎 - ALLOW/DENY/ASK_USER 三种决策', category: 'security' },
     { term: 'MessageBus', definition: '发布/订阅消息总线 - 解耦异步通信', category: 'event' },
     { term: 'ModelRouter', definition: '智能模型路由 - Flash/Pro 策略链选择', category: 'routing' },
+    { term: 'Agent', definition: '子代理框架 - Local（TOML 定义）/ Remote（A2A 协议）', category: 'agent' },
     { term: 'ApprovalMode', definition: '审批级别：Plan/Default/AutoEdit/YOLO', category: 'security' },
     { term: 'MCP', definition: 'Model Context Protocol - 工具动态注册协议', category: 'extension' },
   ];