forcetypeassert 6→0（缓存 list 断言、relay/flared 中间件契约断言、图片压缩 flight 断言，全部带检查+安全失败路径）；errname 1→0；prealloc 2 处（另 1 处与 repo mnd 冲突，用命名常量解决）。nilnil 保留（not-found/可选结果惯例，含接口契约注释）。

Result: {"status":"keep","total_issues":15,"golint_canonicalheader":0,"golint_errname":0,"golint_errorlint":1,"golint_forcetypeassert":0,"golint_gosec":0,"golint_intrange":0,"golint_modernize":3,"golint_nilnil":3,"golint_perfsprint":0,"golint_prealloc":0,"golint_recvcheck":7,"golint_usestdlibvars":0,"golint_wastedassign":0,"golint_total":14,"eslint_problems":1,"eslint_errors":0,"eslint_warnings":1,"tsc_errors":0,"measure_s":43}

internal/apps/upload/filesrv/file_server.go

@@ -206,7 +206,10 @@ func EnsureCompressedImageCache(
 		return nil, false, err
 	}
 
-	res := result.(compressedImageCacheResult)
+	res, ok := result.(compressedImageCacheResult)
+	if !ok {
+		return nil, false, fmt.Errorf("image compression flight returned unexpected type %T", result)
+	}
 	return res.bytes, res.cached, res.err
 }