fix(mcp): pass nativeBinding to DatabaseManager for ABI compatibility

The MCP entry was loading better-sqlite3 from node_modules which may
have been compiled for a different Node.js ABI. Now passes the
pre-built native binding from apps/cli/native/ (maintained by
ensure-native.mjs), matching how other CLI commands handle this.

Co-authored-by: Cursor <cursoragent@cursor.com>

apps/cli/src/mcp.ts

@@ -4,6 +4,8 @@
  * Thin wrapper: initializes Node.js runtime, then delegates to chatlab-mcp.
  */
 
+import fs from 'fs'
+import path from 'path'
 import { loadConfig } from '@openchatlab/config'
 import {
   NodePathProvider,
@@ -14,6 +16,13 @@ import {
 import { startMcpServer } from 'chatlab-mcp'
 import { getVersion } from './version'
 
+function resolveNativeBinding(): string | undefined {
+  if (process.versions.electron) return undefined
+  const nativePath = path.resolve(__dirname, '../native/better_sqlite3.node')
+  if (fs.existsSync(nativePath)) return nativePath
+  return undefined
+}
+
 function initMcpRuntime(): DatabaseManager {
   const config = loadConfig()
   const userDataDir = config.data.user_data_dir || undefined
@@ -26,7 +35,8 @@ function initMcpRuntime(): DatabaseManager {
     process.exit(1)
   }
 
-  return new DatabaseManager(pathProvider)
+  const nativeBinding = resolveNativeBinding()
+  return new DatabaseManager(pathProvider, { nativeBinding })
 }
 
 export async function startCliMcpServer(): Promise<void> {