fix: 架构审查修复 — broadcast、目标校验、import_csv 警告、workspace 元数据统一

- HIGH: CLI 所有修改命令补 broadcast_env_change()
- HIGH: --system/--user 互斥校验，不再静默忽略
- MEDIUM: gui/Cargo.toml 删冗余 serde_json（log 保留，lib.rs 实际使用）
- MEDIUM: import_csv 对跳过行输出 log::warn
- MEDIUM: ProfilePathEntry 从 core 重导出
- LOW: Cargo workspace.package 统一元数据

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

Cargo.toml

@@ -5,3 +5,10 @@ members = [
     "gui",
     "cli",
 ]
+
+[workspace.package]
+version = "5.0.0"
+edition = "2021"
+license = "MIT"
+authors = ["刘航宇"]
+repository = "https://github.com/LHY0125/PathEditor"