Website restoration: Node.js backend, restored design, GitHub sync disabled

- Replaced broken .NET backend with Node.js/Express
- Restored original website design with purple gradient hero
- Updated homepage and shop pages with Bootstrap 5 responsive design
- Disabled GitHub remote sync - all code now stored locally only
- Created backup scripts and documentation
- All changes saved on Ubuntu server at /var/www/SkyArtShop

backend/routes/auth.js

@@ -0,0 +1,50 @@
+const express = require("express");
+const bcrypt = require("bcrypt");
+const { query } = require("../config/database");
+const { redirectIfAuth } = require("../middleware/auth");
+const router = express.Router();
+
+router.get("/login", redirectIfAuth, (req, res) => {
+  res.render("admin/login", {
+    error: req.query.error,
+    title: "Admin Login - SkyArtShop",
+  });
+});
+
+router.post("/login", async (req, res) => {
+  const { email, password } = req.body;
+  try {
+    const result = await query(
+      "SELECT id, email, name, passwordhash, role FROM adminusers WHERE email = $1",
+      [email]
+    );
+    if (result.rows.length === 0) {
+      return res.redirect("/admin/login?error=invalid");
+    }
+    const admin = result.rows[0];
+    const validPassword = await bcrypt.compare(password, admin.passwordhash);
+    if (!validPassword) {
+      return res.redirect("/admin/login?error=invalid");
+    }
+    await query("UPDATE adminusers SET lastlogin = NOW() WHERE id = $1", [
+      admin.id,
+    ]);
+    req.session.adminId = admin.id;
+    req.session.email = admin.email;
+    req.session.name = admin.name;
+    req.session.role = admin.role;
+    res.redirect("/admin/dashboard");
+  } catch (error) {
+    console.error("Login error:", error);
+    res.redirect("/admin/login?error=server");
+  }
+});
+
+router.get("/logout", (req, res) => {
+  req.session.destroy((err) => {
+    if (err) console.error("Logout error:", err);
+    res.redirect("/admin/login");
+  });
+});
+
+module.exports = router;