✨ feat(commands)：为所有命令添加config_path参数支持，实现自定义配置文件路径

♻️ refactor(config)：重构ConfigManager，添加with_path_fresh方法用于初始化新配置
🔧 fix(git)：改进跨平台路径处理，增强git仓库检测的鲁棒性
✅ test(tests)：添加全面的集成测试，覆盖所有命令和跨平台场景

src/config/manager.rs

@@ -19,7 +19,11 @@ impl ConfigManager {
 
     /// Create config manager with specific path
     pub fn with_path(path: &Path) -> Result<Self> {
-        let config = AppConfig::load(path)?;
+        let config = if path.exists() {
+            AppConfig::load(path)?
+        } else {
+            AppConfig::default()
+        };
         Ok(Self {
             config,
             config_path: path.to_path_buf(),
@@ -27,6 +31,15 @@ impl ConfigManager {
         })
     }
 
+    /// Create config manager with fresh config (ignoring existing)
+    pub fn with_path_fresh(path: &Path) -> Result<Self> {
+        Ok(Self {
+            config: AppConfig::default(),
+            config_path: path.to_path_buf(),
+            modified: true,
+        })
+    }
+
     /// Get configuration reference
     pub fn config(&self) -> &AppConfig {
         &self.config