v0.1.2: Add VERSION.txt with build-time injection

backend/package.json

@@ -1,6 +1,6 @@
 {
   "name": "deardiary-backend",
-  "version": "0.0.3",
+  "version": "{{VERSION}}",
   "type": "module",
   "scripts": {
     "dev": "bun --watch src/index.ts",

backend/src/index.ts

@@ -726,7 +726,7 @@ app.post('/api/v1/ai/test', async (c) => {
   }
 });
 
-const DEARDIARY_VERSION = '0.1.0';
+const DEARDIARY_VERSION = '{{VERSION}}';
 const MIN_IMPORT_VERSION = '0.0.3';
 
 interface ExportData {