fix(miner): fix error handling when reading HTTP response body in GeneratePoRepVanillaProof (#13332)

* Fix error handling when reading HTTP response body in GeneratePoRepVanillaProof

After receiving HTTP 200, the function calls io.ReadAll(resp.Body). If ReadAll returns an error the code appends/logs it but does NOT abort/continue; it still closes the body and then returns body, nil. This can return a nil or partially read proof while reporting success, masking errors.
This PR fix the issue.

* fix: ensure response body is manually closed after reading in GeneratePoRepVanillaProof

Author: CertiK-Geth

storage/paths/remote.go

@@ -991,11 +991,12 @@ func (r *Remote) GeneratePoRepVanillaProof(ctx context.Context, sr storiface.Sec
 
 			// Read the response body
 			body, err := io.ReadAll(resp.Body)
+			_ = resp.Body.Close()
 			if err != nil {
 				merr = multierror.Append(merr, xerrors.Errorf("resp.Body ReadAll: %w", err))
 				log.Warnw("GeneratePoRepVanillaProof read response body failed", "url", url, "error", err)
+				continue
 			}
-			_ = resp.Body.Close()
 
 			// Return the proof if successful
 			return body, nil