fix(cli): lazy-load server module so non-serve commands skip node:sqlite

Importing server.js statically also imports db.ts, which pulls in
node:sqlite at startup. On Linux that emits an ExperimentalWarning to
stderr for every CLI invocation -- visible to users running the hook on
every prompt. Defer the server import into the serve action so check
--hook / session-announce / send / peek / list never touch sqlite.

Co-Authored-By: Claude Opus 4.7 (1M context) <noreply@anthropic.com>

node/src/cli.ts

@@ -4,7 +4,6 @@ import { existsSync, readFileSync } from "node:fs";
 import { dirname, join } from "node:path";
 import { fileURLToPath } from "node:url";
 import { resolveConfig, baseUrl, DEFAULT_PORT } from "./config.js";
-import { startServer } from "./server.js";
 import { autostartManager } from "./autostart/index.js";
 import { runStdioMcp } from "./mcp-stdio.js";
 import {
@@ -82,6 +81,7 @@ program
   .action(async (opts: { port?: number; bind?: string; dbPath?: string; config?: string }) => {
     const cfg = resolveConfig(opts);
     try {
+      const { startServer } = await import("./server.js");
       const { app } = await startServer(cfg);
       app.log.info(`ClaudeMailbox listening on ${baseUrl(cfg)} (db: ${cfg.dbPath})`);
     } catch (err) {