fix(dev-server): 修复开发服务器和前端兼容性问题

修复内容:
1. 修复 dev_server.rs 编译错误 - 使用 Vec::new() 替代数组转换
2. 修复 pipeline-client.ts - 添加 Tauri 运行时检测和开发服务器 fallback
3. 更新 troubleshooting.md - 添加开发服务器使用说明

测试结果:
- 所有前端模块正常加载
- 开发服务器 API 响应正确
- 类型检查通过

desktop/src-tauri/Cargo.toml

@@ -17,7 +17,7 @@ tauri-build = { version = "2", features = [] }
 
 [features]
 default = []
-dev-server = ["axum", "tower-http"]
+dev-server = ["dep:axum", "dep:tower-http"]
 
 [dependencies]
 # ZCLAW crates
@@ -72,5 +72,5 @@ rand = { workspace = true }
 sqlx = { workspace = true }
 
 # Development server (optional, only for debug builds)
-axum = { version = "0.7", features = ["ws"], optional = true }
-tower-http = { version = "0.5", optional = true }
+axum = { version = "0.7", optional = true }
+tower-http = { version = "0.5", features = ["cors"], optional = true }