feat: OpsxDB 桌面数据库客户端首版入库

含工作台/连库多引擎字段与 SSH·SSL、结果编辑、Redis 键浏览、
Tauri 桌面与 docs/落地页；排除本地构建产物与 sidecar 二进制。

apps/desktop/src-tauri/Cargo.toml

@@ -0,0 +1,21 @@
+[package]
+name = "opsxdb-desktop"
+version = "0.1.0"
+description = "OpsxDB Tauri desktop shell"
+authors = ["OpsxDB"]
+edition = "2021"
+
+[lib]
+name = "opsxdb_desktop_lib"
+crate-type = ["staticlib", "cdylib", "rlib"]
+
+[build-dependencies]
+tauri-build = { version = "2", features = [] }
+
+[dependencies]
+tauri = { version = "2", features = [] }  # path via Manager
+serde = { version = "1", features = ["derive"] }
+serde_json = "1"
+reqwest = { version = "0.12", default-features = false, features = ["rustls-tls", "json", "blocking"] }
+tokio = { version = "1", features = ["time"] }
+url = "2"