refactor: Remove /ui path prefix

Removed the /ui basePath from Next.js configuration to serve the app at root path:

- Removed basePath: "/ui" from next.config.ts
- Updated all API route calls from /ui/api/* to /api/*
- App now accessible at root path instead of /ui subdirectory

🤖 Generated with [Claude Code](https://claude.com/claude-code)

Co-Authored-By: Claude <noreply@anthropic.com>

app/(dashboard)/spiders/page.tsx

@@ -47,7 +47,7 @@ export default function SpidersPage() {
   const { data: projects, isLoading: isProjectsLoading } = useQuery({
     queryKey: ["projects"],
     queryFn: async (): Promise<ListProjects> => {
-      const res = await fetch("/ui/api/scrapyd/projects");
+      const res = await fetch("/api/scrapyd/projects");
       if (!res.ok) throw new Error("Failed to fetch projects");
       return res.json();
     },
@@ -58,7 +58,7 @@ export default function SpidersPage() {
     queryKey: ["spiders", selectedProject],
     queryFn: async (): Promise<ListSpiders> => {
       const res = await fetch(
-        `/ui/api/scrapyd/spiders?project=${selectedProject}`
+        `/api/scrapyd/spiders?project=${selectedProject}`
       );
       if (!res.ok) throw new Error("Failed to fetch spiders");
       return res.json();
@@ -73,7 +73,7 @@ export default function SpidersPage() {
       spider: string;
       args?: Record<string, string>;
     }) => {
-      const res = await fetch("/ui/api/scrapyd/jobs", {
+      const res = await fetch("/api/scrapyd/jobs", {
         method: "POST",
         headers: { "Content-Type": "application/json" },
         body: JSON.stringify(data),