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-password.js

@@ -0,0 +1,16 @@
+const bcrypt = require("bcrypt");
+
+const password = process.argv[2] || "admin123";
+
+bcrypt.hash(password, 10, (err, hash) => {
+  if (err) {
+    console.error("Error:", err);
+    return;
+  }
+  console.log("Password:", password);
+  console.log("Hash:", hash);
+  console.log("\nUse this SQL to update:");
+  console.log(
+    `UPDATE adminusers SET passwordhash = '${hash}' WHERE email = 'admin@example.com';`
+  );
+});