feat: extract backend

Cargo.lock

@@ -68,6 +68,17 @@ dependencies = [
  "url",
 ]
 
+[[package]]
+name = "async-trait"
+version = "0.1.89"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "9035ad2d096bed7955a320ee7e2230574d28fd3c3a0f186cbea1ff3c7eed5dbb"
+dependencies = [
+ "proc-macro2",
+ "quote",
+ "syn",
+]
+
 [[package]]
 name = "autocfg"
 version = "1.5.0"
@@ -649,6 +660,7 @@ version = "0.1.2"
 dependencies = [
  "anyhow",
  "async-nats",
+ "async-trait",
  "bytes",
  "rand 0.9.1",
  "tokio",