feat(admin): Show version info at top of sidebar

- Add package.json version to /api/version endpoint
- Move version display from footer to top (next to logo)
- Show format: v1.5.1 (abc1234) - 12/9/2024

🤖 Generated with [Claude Code](https://claude.com/claude-code)

Co-Authored-By: Claude Opus 4.5 <noreply@anthropic.com>

backend/src/routes/version.ts

@@ -1,7 +1,18 @@
 import { Router, Request, Response } from 'express';
+import { readFileSync } from 'fs';
+import { join } from 'path';
 
 const router = Router();
 
+// Read package.json version at startup
+let packageVersion = 'unknown';
+try {
+  const packageJson = JSON.parse(readFileSync(join(__dirname, '../../package.json'), 'utf-8'));
+  packageVersion = packageJson.version || 'unknown';
+} catch {
+  // Fallback if package.json not found
+}
+
 /**
  * GET /api/version
  * Returns build version information for display in admin UI
@@ -10,10 +21,11 @@ router.get('/', async (req: Request, res: Response) => {
   try {
     const gitSha = process.env.APP_GIT_SHA || 'unknown';
     const versionInfo = {
+      version: packageVersion,
       build_version: process.env.APP_BUILD_VERSION?.slice(0, 8) || 'dev',
       git_sha: gitSha.slice(0, 8) || 'unknown',
       git_sha_full: gitSha,
-      build_time: process.env.APP_BUILD_TIME || new Date().toISOString(),
+      build_time: process.env.APP_BUILD_TIME || 'unknown',
       image_tag: process.env.CONTAINER_IMAGE_TAG?.slice(0, 8) || 'local',
     };