feat: API client with streaming, OAuth, and provider abstraction

rust/crates/api/Cargo.toml

@@ -0,0 +1,16 @@
+[package]
+name = "api"
+version.workspace = true
+edition.workspace = true
+license.workspace = true
+publish.workspace = true
+
+[dependencies]
+reqwest = { version = "0.12", default-features = false, features = ["json", "rustls-tls"] }
+runtime = { path = "../runtime" }
+serde = { version = "1", features = ["derive"] }
+serde_json.workspace = true
+tokio = { version = "1", features = ["io-util", "macros", "net", "rt-multi-thread", "time"] }
+
+[lints]
+workspace = true