refactor: rearrange target positions in BUILD.gn files Move ohos_unittest target blocks to improve code organization without changing any build logic: - service/BUILD.gn: swap two groups of unittest targets (788+788 lines) - frameworks/proxy/BUILD.gn: swap two groups of unittest targets (471+413 lines) Total: 2 files changed, 2402 lines rearranged (pure position swap) Change-Id: I771aa6d160cbc8d3f93c2ab5d559a9da4696dbe1 Signed-off-by: xueyuanzhao <zhaoxueyuan@huawei.com> Co-Authored-By: Agent Signed-off-by: xueyuanzhao <zhaoxueyuan@huawei.com> | 