feat(后端架构): 完善GG后端，修复渐变与选区异常

ofdgo_font_source_native.go

@@ -0,0 +1,21 @@
+// Copyright 2025-2026 肖其顿 (XIAO QI DUN)
+//
+// Licensed under the Apache License, Version 2.0 (the "License");
+// you may not use this file except in compliance with the License.
+// You may obtain a copy of the License at
+//
+// http://www.apache.org/licenses/LICENSE-2.0
+//
+// Unless required by applicable law or agreed to in writing, software
+// distributed under the License is distributed on an "AS IS" BASIS,
+// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+// See the License for the specific language governing permissions and
+// limitations under the License.
+
+//go:build !js || !wasm
+
+package ofdgo
+
+// canLoadSystemFonts 判断是否可以读取系统字体
+// 返回: bool 是否可以读取
+func canLoadSystemFonts() bool { return true }