feat: add version display to UI and API

## Changes

### Version System
- Added version pattern: YYYY.MM.PATCH (e.g., 2026.01.1)
- Created version.ts files for both API and web packages
- Initial version: 2026.01.1

### Web UI
- Display version in small green text (light green: #90ee90) under Basil logo
- Added hover tooltip showing "Version 2026.01.1"
- Logo link also shows version in title attribute
- Styled with opacity transition for hover effect

### API
- Added /api/version endpoint returning JSON: {"version": "2026.01.1"}
- Updated server startup message to show version
- Console output: "🌿 Basil API server v2026.01.1 running on..."

### CSS Styling
- .logo-container: Flex column layout for logo and version
- .version: 0.65rem font, light green (#90ee90), 0.85 opacity
- Hover increases opacity to 1.0 for better visibility
- Cursor set to "help" to indicate tooltip

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

packages/api/src/index.ts

@@ -12,6 +12,7 @@ import authRoutes from './routes/auth.routes';
 import mealPlansRoutes from './routes/meal-plans.routes';
 import './config/passport'; // Initialize passport strategies
 import { testEmailConfig } from './services/email.service';
+import { APP_VERSION } from './version';
 
 dotenv.config();
 
@@ -45,13 +46,18 @@ app.get('/health', (req, res) => {
   res.json({ status: 'ok', timestamp: new Date().toISOString() });
 });
 
+// Version endpoint
+app.get('/api/version', (req, res) => {
+  res.json({ version: APP_VERSION });
+});
+
 // Export app for testing
 export default app;
 
 // Start server only if this file is run directly (not imported)
 if (require.main === module) {
   app.listen(PORT, async () => {
-    console.log(`🌿 Basil API server running on http://localhost:${PORT}`);
+    console.log(`🌿 Basil API server v${APP_VERSION} running on http://localhost:${PORT}`);
 
     // Test email configuration on startup
     await testEmailConfig();

packages/api/src/version.ts

@@ -0,0 +1,5 @@
+/**
+ * Application version following the pattern: YYYY.MM.PATCH
+ * Example: 2026.01.1 (January 2026, patch 1)
+ */
+export const APP_VERSION = '2026.01.1';