feat(auth): implement better authentication system with user sessions and password management

- Added user, session, account, and verification models to Prisma schema.
- Integrated better-auth for user authentication with email and password.
- Created auth middleware for session validation.
- Implemented auth context and client in frontend for managing user sessions.
- Added login and settings pages for user authentication and password management.
- Updated routes to include authentication checks and user-specific content.
- Enhanced UI components to reflect authentication state.

apps/backend/prisma/seed.ts

@@ -0,0 +1,58 @@
+import "dotenv/config";
+import { betterAuth } from "better-auth";
+import { prismaAdapter } from "better-auth/adapters/prisma";
+import { PrismaClient } from "../src/generated/prisma/client";
+import { PrismaPg } from "@prisma/adapter-pg";
+
+const adapter = new PrismaPg({ connectionString: process.env.DATABASE_URL! });
+const prisma = new PrismaClient({ adapter });
+
+async function main() {
+  const existingUser = await prisma.user.findUnique({
+    where: { email: "jselesan@gmail.com" },
+  });
+
+  if (existingUser) {
+    console.log("Admin user already exists, skipping seed.");
+    return;
+  }
+
+  const auth = betterAuth({
+    database: prismaAdapter(prisma, {
+      provider: "postgresql",
+    }),
+    emailAndPassword: {
+      enabled: true,
+      disableSignUp: false,
+      minPasswordLength: 4,
+    },
+    secret: process.env.BETTER_AUTH_SECRET!,
+    baseURL: process.env.BETTER_AUTH_URL ?? "http://localhost:3000",
+  });
+
+  const password = process.env.ADMIN_PASSWORD;
+
+  if (!password) {
+    console.error("ADMIN_PASSWORD environment variable is not set.");
+    process.exit(1);
+  }
+
+  await auth.api.signUpEmail({
+    body: {
+      email: "jselesan@gmail.com",
+      password,
+      name: "Admin",
+    },
+  });
+
+  console.log("Admin user created successfully.");
+}
+
+main()
+  .catch((e) => {
+    console.error(e);
+    process.exit(1);
+  })
+  .finally(async () => {
+    await prisma.$disconnect();
+  });