refactor: migrate from @hey-api/openapi-ts to openapi-react-query

- Replace @hey-api/openapi-ts with openapi-typescript and openapi-react-query
- Generate TypeScript types from OpenAPI spec
- Set up React Query infrastructure with QueryClientProvider
- Migrate all API hooks to use React Query patterns
- Maintain backward compatibility for existing components
- Remove old API infrastructure and dependencies

www/app/lib/useApi.ts

@@ -1,37 +0,0 @@
-import { useSession, signOut } from "next-auth/react";
-import { useContext, useEffect, useState } from "react";
-import { DomainContext, featureEnabled } from "../domainContext";
-import { OpenApi, DefaultService } from "../api";
-import { CustomSession } from "./types";
-import useSessionStatus from "./useSessionStatus";
-import useSessionAccessToken from "./useSessionAccessToken";
-
-export default function useApi(): DefaultService | null {
-  const api_url = useContext(DomainContext).api_url;
-  const [api, setApi] = useState<OpenApi | null>(null);
-  const { isLoading, isAuthenticated } = useSessionStatus();
-  const { accessToken, error } = useSessionAccessToken();
-
-  if (!api_url) throw new Error("no API URL");
-
-  useEffect(() => {
-    if (error === "RefreshAccessTokenError") {
-      signOut();
-    }
-  }, [error]);
-
-  useEffect(() => {
-    if (isLoading || (isAuthenticated && !accessToken)) {
-      return;
-    }
-
-    const openApi = new OpenApi({
-      BASE: api_url,
-      TOKEN: accessToken || undefined,
-    });
-
-    setApi(openApi);
-  }, [isLoading, isAuthenticated, accessToken]);
-
-  return api?.default ?? null;
-}