feat: 重构为 Monorepo 架构并实现 HTTP Server

架构变更:
- 采用 pnpm workspaces 实现 Monorepo 结构
- 将现有代码迁移到 packages/core
- 新增 packages/server HTTP 服务层

Server 功能:
- REST API: 会话管理、工具管理、配置管理
- WebSocket: 实时双向通信支持
- SSE: 服务端事件推送
- Hono + Bun 作为运行时

API 端点:
- GET/POST /api/sessions - 会话 CRUD
- GET/POST /api/sessions/:id/messages - 消息管理
- GET /api/sessions/:id/events - SSE 事件流
- WS /api/ws/:sessionId - WebSocket 连接
- GET/POST /api/tools - 工具管理
- GET/PUT /api/config - 配置管理

packages/core/src/permission/prompt.ts

@@ -0,0 +1,79 @@
+import * as readline from 'readline';
+import chalk from 'chalk';
+import type { PermissionContext, PermissionDecision } from './types.js';
+
+/**
+ * 在终端中提示用户确认权限
+ */
+export async function promptPermission(ctx: PermissionContext): Promise<PermissionDecision> {
+  const rl = readline.createInterface({
+    input: process.stdin,
+    output: process.stdout,
+  });
+
+  return new Promise((resolve) => {
+    console.log('');
+    console.log(chalk.yellow('⚠️  权限确认'));
+    console.log(chalk.cyan('命令: ') + chalk.white(ctx.command));
+    console.log(chalk.cyan('目录: ') + chalk.gray(ctx.workdir));
+
+    if (ctx.externalPaths && ctx.externalPaths.length > 0) {
+      console.log(chalk.red('⚠️  此命令访问项目目录外的路径:'));
+      ctx.externalPaths.forEach(p => {
+        console.log(chalk.red('   • ') + chalk.gray(p));
+      });
+    }
+
+    if (ctx.patterns && ctx.patterns.length > 0) {
+      console.log(chalk.gray('匹配模式: ') + ctx.patterns.join(', '));
+    }
+
+    console.log('');
+    console.log(chalk.white('选择操作:'));
+    console.log(chalk.green('  [y] ') + '允许执行');
+    console.log(chalk.green('  [Y] ') + '允许执行，并记住此类命令（本次会话）');
+    console.log(chalk.red('  [n] ') + '拒绝执行');
+    console.log(chalk.red('  [N] ') + '拒绝执行，并记住此类命令（本次会话）');
+    console.log('');
+
+    rl.question(chalk.yellow('请选择 [y/Y/n/N]: '), (answer) => {
+      rl.close();
+
+      const choice = answer.trim();
+
+      switch (choice) {
+        case 'y':
+          resolve({ allow: true, remember: false });
+          break;
+        case 'Y':
+          resolve({ allow: true, remember: true });
+          break;
+        case 'N':
+          resolve({ allow: false, remember: true });
+          break;
+        case 'n':
+        default:
+          resolve({ allow: false, remember: false });
+          break;
+      }
+    });
+  });
+}
+
+/**
+ * 显示权限被拒绝的消息
+ */
+export function showPermissionDenied(command: string, reason: string): void {
+  console.log('');
+  console.log(chalk.red('🚫 权限被拒绝'));
+  console.log(chalk.cyan('命令: ') + chalk.white(command));
+  console.log(chalk.cyan('原因: ') + chalk.gray(reason));
+  console.log('');
+}
+
+/**
+ * 显示权限允许的消息
+ */
+export function showPermissionAllowed(command: string): void {
+  console.log(chalk.green('✓ ') + chalk.gray(`执行: ${command}`));
+}