fix(payload-ai): convert server actions to api endpoints, drop @payload-config dependency

packages/payload-ai/src/components/OptimizeButton.tsx

@@ -2,7 +2,6 @@
 
 import React, { useState, useEffect } from "react";
 import { useForm, useDocumentInfo } from "@payloadcms/ui";
-import { optimizePostText } from "../actions/optimizePost.js";
 import { Button } from "@payloadcms/ui";
 
 export function OptimizeButton() {
@@ -57,7 +56,12 @@ export function OptimizeButton() {
             // 2. We inject the title so the AI knows what it's writing about
             const payloadText = `---\ntitle: "${title}"\n---\n\n${draftContent}`;
 
-            const response = await optimizePostText(payloadText, instructions);
+            const res = await fetch("/api/api/mintel-ai/optimize", {
+                method: "POST",
+                headers: { "Content-Type": "application/json" },
+                body: JSON.stringify({ draftContent: payloadText, instructions }),
+            });
+            const response = await res.json();
 
             if (response.success && response.lexicalAST) {
                 // 3. Inject the new Lexical AST directly into the field form state