Extract yaak-api crate with sysproxy for OS-level proxy detection

- New crates/yaak-api crate with no Tauri dependency
- Uses sysproxy to auto-detect OS proxy settings (macOS, Windows, Linux)
- Moved yaak_api_client from yaak-tauri-utils, now takes version string
- Removed api_client and error modules from yaak-tauri-utils
- Updated all callers in license, plugins, notifications, and URI scheme

crates-tauri/yaak-tauri-utils/Cargo.toml

@@ -6,10 +6,4 @@ publish = false
 
 [dependencies]
 tauri = { workspace = true }
-reqwest = { workspace = true, features = ["gzip"] }
-thiserror = { workspace = true }
-serde = { workspace = true, features = ["derive"] }
 regex = "1.11.0"
-yaak-common = { workspace = true }
-yaak-models = { workspace = true }
-log = { workspace = true }