桌面 GUI 外链修复 + 主题顺序调整（含结构扁平化进行中的工作区基线）

- 集成 tauri-plugin-opener：Cargo/lib.rs/capabilities/npm 四处接线，新增 src/openExternal.ts（桌面走 opener，浏览器回退 window.open，相对路径绝对化）
- 关于页 4 个链接、活动栏官网菜单、代理错误横幅 2 处健康检查链接全部改走 openExternal，桌面端可正常跳转
- 设置→外观 主题顺序调整为 深色/浅色/跟随系统
- release 二进制重编并验证（浏览器实测关于页链接可开文档页）
- 附带工作区中未提交的扁平化重构现状（另一会话进行中）
- homepage 落地页与文档终检通过（8787 / 与 /docs 双 200）

src-tauri/Cargo.toml

@@ -0,0 +1,31 @@
+[package]
+name = "opsxapi"
+version = "0.1.0"
+description = "OpsxAPI — API workbench for ops & developers"
+authors = ["OpsxAPI"]
+edition = "2021"
+default-run = "OpsxAPI"
+
+[lib]
+name = "opsxapi_lib"
+crate-type = ["staticlib", "cdylib", "rlib"]
+
+[[bin]]
+name = "OpsxAPI"
+path = "src/main.rs"
+
+[build-dependencies]
+tauri-build = { version = "2", features = [] }
+
+[dependencies]
+tauri = { version = "2", features = [] }
+tauri-plugin-opener = "2"  # External link jump (About page/documentation/website)
+serde = { version = "1", features = ["derive"] }
+serde_json = "1"
+reqwest = { version = "0.12", default-features = false, features = ["rustls-tls", "json"] }
+tokio = { version = "1", features = ["macros", "rt-multi-thread", "sync", "time", "net"] }
+url = "2"
+tokio-tungstenite = { version = "0.24", features = ["rustls-tls-webpki-roots"] }
+futures-util = "0.3"
+uuid = { version = "1", features = ["v4"] }
+http = "1"