added api server and changed docker files

login-auth_backend/api-server.js

@@ -0,0 +1,40 @@
+// static variables and imports
+import express from "express";
+import {
+  loginUser,
+  createUser,
+  updateUser,
+  deleteUser,
+  getAllUsers,
+} from "../shared/database.js";
+import dotenv from "dotenv";
+import path from "path";
+import { fileURLToPath } from "url";
+const app = express();
+dotenv.config();
+const port = 4002;
+
+app.use(express.json());
+app.use(express.static("public"));
+
+app.use(express.urlencoded({ extended: true }));
+app.set("view engine", "ejs");
+
+const __filename = fileURLToPath(import.meta.url);
+const __dirname = path.dirname(__filename);
+
+app.listen(port, () => {
+  console.log(`API login server is running on http://localhost:${port}`);
+});
+
+app.post("/login", (req, res) => {
+  console.log("Received login request:", req.body);
+  const { username, password } = req.body;
+  loginUser(username, password).then((result) => {
+    if (result.success) {
+      return res.json({ loginQuery: true });
+    } else {
+      return res.json({ loginQuery: false, message: result.message });
+    }
+  });
+});