fix(fm): switch createFM to POST to match backend CSRF fix

Backend moves /api/v1/file from GET to POST so SameSite=Lax cookies
can no longer expose this state-changing endpoint to cross-site
CSRF. Update createFM() accordingly.

Co-authored-by: cloudcode <cloudcode@users.noreply.github.com>

src/api/fm.ts

@@ -3,5 +3,5 @@ import { ModelCreateFMResponse } from "@/types"
 import { FetcherMethod, fetcher } from "./api"
 
 export const createFM = async (id: string): Promise<ModelCreateFMResponse> => {
-    return fetcher<ModelCreateFMResponse>(FetcherMethod.GET, `/api/v1/file?id=${id}`, null)
+    return fetcher<ModelCreateFMResponse>(FetcherMethod.POST, `/api/v1/file?id=${id}`, null)
 }