feat: add MQTT journal server for session persistence

Implement a journal server that uses an Aedes MQTT broker to
persist stream messages to JSONL files and manage session metadata
via a manifest.

- Add `aedes`, `mqtt`, and `zod` dependencies
- Implement `createJournalServer` in `src/cli/journal.ts`
- Integrate journal server into the `serve` command
- Add `--mqtt-port` option to the CLI
- Add session lifecycle management (create, update, delete) via
  retained MQTT topics

src/cli/index.ts

@@ -1,33 +1,33 @@
 #!/usr/bin/env node
-import { Command } from 'commander';
-import { serveCommand } from './commands/serve.js';
-import { compileCommand } from './commands/compile.js';
-import { mcpCommand } from './commands/mcp.js';
-import type { ServeOptions, CompileOptions } from './types.js';
+import { Command } from "commander";
+import { serveCommand } from "./commands/serve.js";
+import { compileCommand } from "./commands/compile.js";
+import { mcpCommand } from "./commands/mcp.js";
+import type { ServeOptions, CompileOptions } from "./types.js";
 
 const program = new Command();
 
 program
-  .name('ttrpg')
-  .description('TTRPG 工具箱 - 用于编译和预览 TTRPG 文档')
-  .version('0.0.1');
+  .name("ttrpg")
+  .description("TTRPG 工具箱 - 用于编译和预览 TTRPG 文档")
+  .version("0.0.1");
 
 program
-  .command('serve')
-  .description('运行一个 web 服务器预览目录中的内容，并实时监听更新')
-  .argument('[dir]', '要预览的目录', '.')
-  .option('-p, --port <port>', '端口号', '3000')
-  .option('-h, --host <host>', '主机地址', '0.0.0.0')
+  .command("serve")
+  .description("运行一个 web 服务器预览目录中的内容，并实时监听更新")
+  .argument("[dir]", "要预览的目录", ".")
+  .option("-p, --port <port>", "HTTP 端口号", "3000")
+  .option("--mqtt-port <port>", "MQTT 代理端口号", "1883")
+  .option("-h, --host <host>", "主机地址", "0.0.0.0")
   .action(serveCommand);
 
 program
-  .command('compile')
-  .description('将目录中的内容输出为带 hash 路由、单个 html 入口的 web 应用')
-  .argument('[dir]', '要编译的目录', '.')
-  .option('-o, --output <dir>', '输出目录', './dist/output')
+  .command("compile")
+  .description("将目录中的内容输出为带 hash 路由、单个 html 入口的 web 应用")
+  .argument("[dir]", "要编译的目录", ".")
+  .option("-o, --output <dir>", "输出目录", "./dist/output")
   .action(compileCommand);
 
-program
-  .addCommand(mcpCommand);
+program.addCommand(mcpCommand);
 
 program.parse();