feat: bootstrap backend API, schema and forgejo task issues

backend/src/db/seed.js

@@ -0,0 +1,20 @@
+import bcrypt from 'bcryptjs';
+import { pool } from './connection.js';
+
+const run = async () => {
+  const hash = await bcrypt.hash('changeme123', 12);
+  await pool.query(
+    `INSERT INTO users (email, password_hash, display_name) VALUES (?, ?, ?)
+     ON DUPLICATE KEY UPDATE display_name = VALUES(display_name)`,
+    ['demo@helpyourneighbour.ch', hash, 'Demo User']
+  );
+
+  console.log('Seed complete.');
+  await pool.end();
+};
+
+run().catch(async (err) => {
+  console.error('Seed failed:', err.message);
+  await pool.end();
+  process.exit(1);
+});