[router] migrate router from actix to axum (#8479)

sgl-router/Cargo.toml

@@ -10,41 +10,41 @@ name = "sglang_router_rs"
 crate-type = ["cdylib", "rlib"]
 
 [dependencies]
-actix-web = "4.0"
+axum = { version = "0.8.4", features = ["macros", "ws", "tracing"] }
+tower = { version = "0.5", features = ["full"] }
+tower-http = { version = "0.6", features = ["trace", "compression-gzip", "cors", "timeout", "limit", "request-id", "util"] }
 serde = { version = "1.0", features = ["derive"] }
-clap = { version = "4.4", features = ["derive"] }
+serde_json = "1.0"
 bytes = "1.8.0"
 rand = "0.8.5"
 reqwest = { version = "0.12.8", features = ["stream", "blocking", "json"] }
 futures-util = "0.3"
-serde_json = "1.0"
+futures = "0.3"
 pyo3 = { version = "0.22.5", features = ["extension-module"] }
 dashmap = "6.1.0"
 http = "1.1.0"
-tokio = { version = "1.42.0", features = ["macros", "rt-multi-thread"] }
-# Added for enhanced logging system
+tokio = { version = "1.42.0", features = ["full"] }
+async-trait = "0.1"
+once_cell = "1.21"
 tracing = "0.1"
 tracing-subscriber = { version = "0.3", features = ["env-filter", "json", "chrono"] }
 tracing-log = "0.2"
 tracing-appender = "0.2.3"
+chrono = "0.4"
 kube = { version = "0.88.1", features = ["runtime", "derive"] }
 k8s-openapi = { version = "0.21.0", features = ["v1_29"] }
-futures = "0.3"
-async-trait = "0.1"
-once_cell = "1.21"
-# Added for metrics
 metrics = "0.24.2"
 metrics-exporter-prometheus = "0.17.0"
-# Added for request tracing
 uuid = { version = "1.10", features = ["v4", "serde"] }
 thiserror = "2.0.12"
 url = "2.5.4"
+tokio-stream = { version = "0.1", features = ["sync"] }
 
 [dev-dependencies]
 criterion = { version = "0.5", features = ["html_reports"] }
-tokio-stream = "0.1"
-actix-http = "3.0"
-futures = "0.3"
+tower = { version = "0.5", features = ["util"] }
+http-body-util = "0.1"
+portpicker = "0.1"
 
 [[bench]]
 name = "request_processing"