feat: HTTP/SSE server crate with axum (session management, event streaming)

rust/crates/server/Cargo.toml

@@ -0,0 +1,20 @@
+[package]
+name = "server"
+version.workspace = true
+edition.workspace = true
+license.workspace = true
+publish.workspace = true
+
+[dependencies]
+async-stream = "0.3"
+axum = "0.8"
+runtime = { path = "../runtime" }
+serde = { version = "1", features = ["derive"] }
+serde_json.workspace = true
+tokio = { version = "1", features = ["macros", "rt-multi-thread", "sync", "net", "time"] }
+
+[dev-dependencies]
+reqwest = { version = "0.12", default-features = false, features = ["json", "rustls-tls", "stream"] }
+
+[lints]
+workspace = true