Fix admin route access and backend configuration

- Added /admin redirect to login page in nginx config
- Fixed backend server.js route ordering for proper admin handling
- Updated authentication middleware and routes
- Added user management routes
- Configured PostgreSQL integration
- Updated environment configuration

backend/generate-hash.js

@@ -0,0 +1,20 @@
+const bcrypt = require("bcrypt");
+
+async function generateHash() {
+  const password = "Admin123!";
+  const hash = await bcrypt.hash(password, 10);
+
+  console.log("Password:", password);
+  console.log("Hash:", hash);
+  console.log("\nSQL to insert user:");
+  console.log(
+    `INSERT INTO adminusers (email, name, passwordhash, role) VALUES ('admin@skyartshop.com', 'Admin User', '${hash}', 'superadmin') ON CONFLICT (email) DO UPDATE SET passwordhash = '${hash}';`
+  );
+}
+
+generateHash()
+  .then(() => process.exit(0))
+  .catch((err) => {
+    console.error(err);
+    process.exit(1);
+  });