docs: replace README with Next.js boilerplate template

Updated README.md from a detailed OllaHub project description to the standard Next.js getting started template, likely to initialize or reset the project as a Next.js application.

lib/chat.ts

@@ -0,0 +1,50 @@
+export type ChatRole = "user" | "assistant" | "system";
+
+export type Message = {
+  id: string;
+  role: ChatRole;
+  content: string;
+  timestamp: number;
+};
+
+export type ChatState = {
+  messages: Message[];
+  selectedModel: string | null;
+  isStreaming: boolean;
+  streamingContent: string;
+};
+
+export function createMessage(role: ChatRole, content: string): Message {
+  return {
+    id: crypto.randomUUID(),
+    role,
+    content,
+    timestamp: Date.now(),
+  };
+}
+
+export function formatTimestamp(timestamp: number): string {
+  const now = Date.now();
+  const diff = now - timestamp;
+  const minutes = Math.floor(diff / 60000);
+
+  if (minutes < 1) return "agora";
+  if (minutes < 60) return `${minutes} min atrás`;
+
+  const hours = Math.floor(minutes / 60);
+  if (hours < 24) return `${hours}h atrás`;
+
+  const days = Math.floor(hours / 24);
+  return `${days}d atrás`;
+}
+
+export function convertToOllamaMessages(messages: Message[]) {
+  return messages.map((msg) => ({
+    role: msg.role,
+    content: msg.content,
+  }));
+}
+
+export function createSystemMessage(content: string): Message {
+  return createMessage("system", content);
+}