chore: adds versions and copyright

backend/package.json

@@ -1,6 +1,6 @@
 {
   "name": "@family-budget/backend",
-  "version": "0.1.0",
+  "version": "0.5.12",
   "private": true,
   "scripts": {
     "dev": "tsx watch src/app.ts",

backend/src/app.ts

@@ -1,3 +1,5 @@
+import fs from 'fs';
+import path from 'path';
 import express from 'express';
 import cookieParser from 'cookie-parser';
 import cors from 'cors';
@@ -5,6 +7,10 @@ import { config } from './config';
 import { runMigrations } from './db/migrate';
 import { requireAuth } from './middleware/auth';
 
+const pkg = JSON.parse(
+  fs.readFileSync(path.join(__dirname, '..', 'package.json'), 'utf-8'),
+) as { version: string };
+
 import authRouter from './routes/auth';
 import importRouter from './routes/import';
 import importsRouter from './routes/imports';
@@ -24,6 +30,10 @@ app.use(cors({ origin: true, credentials: true }));
 // Auth routes (login is public; me/logout apply auth internally)
 app.use('/api/auth', authRouter);
 
+app.get('/api/version', (_req, res) => {
+  res.json({ version: pkg.version });
+});
+
 // All remaining /api routes require authentication
 app.use('/api', requireAuth);
 app.use('/api/import', importRouter);