feat: 从黄果 NET hgdjnet-server 9bfbafe 导入 HKDJ 官网后端

来源：hgdjnet-server 9bfbafe10d417deea959bd53117bc88a10e60a83
项目身份 HKDJ / JHA-216，独立官网仓库，Jenkins 守卫键 hkdjnet
测试目录 /server/hkdj_net，App/Web API 30331/30332

Co-Authored-By: Claude Opus 4.7 <noreply@anthropic.com>

Makefile

@@ -0,0 +1,12 @@
+.DEFAULT_GOAL := help
+.PHONY: help app web check
+
+help:
+	@printf '%s\n' 'make app / make web: build the selected backend' 'make check: compile both backends'
+
+app web:
+	./scripts/build.sh $@
+
+check:
+	./scripts/build.sh app
+	./scripts/build.sh web