Add Axum backend experiment

alt/rust/Cargo.toml

@@ -0,0 +1,25 @@
+[package]
+name = "ytplayer-rust-backend"
+version = "0.1.0"
+edition = "2021"
+
+[dependencies]
+axum = { version = "0.8", features = ["http1", "tokio", "query", "json"] }
+base64 = "0.22"
+brotli = "9"
+bytes = "1"
+flate2 = "1"
+futures-util = "0.3"
+hex = "0.4"
+http = "1"
+mime_guess = "2"
+regex = "1"
+reqwest = { version = "0.12", default-features = false, features = ["rustls-tls", "json", "stream", "gzip", "brotli"] }
+rusqlite = { version = "0.32", features = ["bundled"] }
+serde = { version = "1", features = ["derive"] }
+serde_json = { version = "1", features = ["preserve_order"] }
+sha2 = "0.10"
+tokio = { version = "1", features = ["full"] }
+tokio-util = { version = "0.7", features = ["io"] }
+tower-http = { version = "0.6", features = ["compression-full", "cors", "trace"] }
+url = "2"