feat(api): add version endpoint for instance identification

Adds GET /api/version endpoint that returns:
- Application version
- Application name
- Build time (if available)
- Git commit hash (if available)
- Node environment

This helps users identify the version of a running Sim Studio instance.

Fixes #2014

Author: majiayu000

apps/sim/app/api/version/route.ts

@@ -0,0 +1,24 @@
+import { NextResponse } from 'next/server'
+
+export const dynamic = 'force-dynamic'
+
+// Version from package.json - updated during build process
+const APP_VERSION = process.env.npm_package_version || process.env.APP_VERSION || '0.1.0'
+const APP_NAME = 'sim-studio'
+
+/**
+ * GET /api/version
+ * Returns the current version information of the Sim Studio instance
+ */
+export async function GET() {
+  const buildTime = process.env.BUILD_TIME || null
+  const gitCommit = process.env.VERCEL_GIT_COMMIT_SHA || process.env.GIT_COMMIT || null
+
+  return NextResponse.json({
+    version: APP_VERSION,
+    name: APP_NAME,
+    buildTime,
+    gitCommit: gitCommit ? gitCommit.substring(0, 7) : null,
+    nodeEnv: process.env.NODE_ENV,
+  })
+}