feat: prep work for web UI

sparse-server/Cargo.toml

@@ -19,6 +19,10 @@ tower-http = { version = "0.5", features = ["fs"], optional = true }
 wasm-bindgen = "=0.2.95"
 thiserror = "1"
 http = "1"
+axum-server = { version = "0.7.1", features = ["tokio-rustls"], optional = true }
+tracing-subscriber = { version = "0.3.19", features = ["chrono", "env-filter", "serde", "tracing", "tracing-serde"], optional = true }
+structopt = { version = "0.3", optional = true }
+anyhow = "1.0.95"
 
 [features]
 hydrate = ["leptos/hydrate"]
@@ -28,6 +32,9 @@ ssr = [
   "dep:tower",
   "dep:tower-http",
   "dep:leptos_axum",
+  "dep:axum-server",
+  "dep:tracing-subscriber",
+  "dep:structopt",
   "leptos/ssr",
   "leptos_meta/ssr",
   "leptos_router/ssr",