refactor(core): move app para src e padroniza estrutura

src/shared/lib/auth/server.ts

@@ -0,0 +1,66 @@
+import { headers } from "next/headers";
+import { redirect } from "next/navigation";
+import { cache } from "react";
+import { auth } from "@/shared/lib/auth/config";
+
+/**
+ * Cached session fetch - deduplicates auth calls within a single request.
+ * Layout + page calling getUser() will only hit auth once.
+ */
+const getSessionCached = cache(async () => {
+	return auth.api.getSession({ headers: await headers() });
+});
+
+/**
+ * Gets the current authenticated user
+ * @returns User object
+ * @throws Redirects to /login if user is not authenticated
+ */
+export async function getUser() {
+	const session = await getSessionCached();
+
+	if (!session?.user) {
+		redirect("/login");
+	}
+
+	return session.user;
+}
+
+/**
+ * Gets the current authenticated user ID
+ * @returns User ID string
+ * @throws Redirects to /login if user is not authenticated
+ */
+export async function getUserId() {
+	const session = await getSessionCached();
+
+	if (!session?.user) {
+		redirect("/login");
+	}
+
+	return session.user.id;
+}
+
+/**
+ * Gets the current authenticated session
+ * @returns Full session object including user
+ * @throws Redirects to /login if user is not authenticated
+ */
+export async function getUserSession() {
+	const session = await getSessionCached();
+
+	if (!session?.user) {
+		redirect("/login");
+	}
+
+	return session;
+}
+
+/**
+ * Gets the current session without requiring authentication
+ * @returns Session object or null if not authenticated
+ * @note This function does not redirect if user is not authenticated
+ */
+export async function getOptionalUserSession() {
+	return getSessionCached();
+}