fix(ci): Windows 构建清除 cp 复制的插件软链，避免 PathExists(errno 183)

cp -r 把 windows/flutter/ephemeral/.plugin_symlinks 复制成真实目录，
flutter createPluginSymlinks 只清软链、清不掉真目录，重建时撞车。
复制后删除 ephemeral/.dart_tool/build，由 flutter 干净重建。

Co-Authored-By: Claude Opus 4.8 <noreply@anthropic.com>

CHANGELOG.md

@@ -5,6 +5,11 @@ All notable changes to this project will be documented in this file.
 The format is based on [Keep a Changelog](https://keepachangelog.com/en/1.0.0/),
 and this project adheres to [Semantic Versioning](https://semver.org/spec/v2.0.0.html).
 
+## [1.0.7] - 2026-06-03
+
+### 修复
+- 修复 Windows 构建 `PathExistsException`（errno 183）：复制 client/ 到 C:\jiu-build 后，先清除 cp 复制成真实目录的插件软链（windows/flutter/ephemeral）及 .dart_tool/build，再交给 flutter 干净重建
+
 ## [1.0.6] - 2026-06-03
 
 ### 改进

scripts/ci/compile-windows.sh

@@ -27,6 +27,14 @@ rm -rf "$BUILD_ROOT"
 mkdir -p "$BUILD_ROOT"
 cp -r client "$BUILD_CLIENT"
 
+# `cp -r` turns Flutter's plugin symlinks (windows/flutter/ephemeral/.plugin_symlinks/*)
+# into real directories. flutter's createPluginSymlinks only cleans up *symlinks*, so it
+# then fails to create a symlink over the copied real dir (errno 183 / PathExists).
+# Drop all regenerable artifacts so the build below recreates them cleanly.
+rm -rf "${BUILD_CLIENT}/windows/flutter/ephemeral" \
+       "${BUILD_CLIENT}/.dart_tool" \
+       "${BUILD_CLIENT}/build"
+
 # Build (run from the clean path; pushd/popd avoids needing $() to save cwd)
 pushd "$BUILD_CLIENT" > /dev/null
 flutter create --platforms=windows . --project-name jiu_client