ref(backend) start of refactor

backend/api_server/Cargo.toml

@@ -0,0 +1,12 @@
+[package]
+name = "api_server"
+version = "0.1.0"
+edition = "2021"
+
+[dependencies]
+constants = { path = "../constants" }
+chrono = "0.4.38"
+tracing = "0.1.40"
+tracing-subscriber = "0.3.18"
+tracing-appender = "0.2.3"
+dotenv = "0.15.0"