migrated backend structure to Axum API setup, added core modules (models, services, api), integrated dotenv for configuration management, and added project roadmap for future phases

backend-rust/Cargo.lock

@@ -317,6 +317,12 @@ dependencies = [
  "syn",
 ]
 
+[[package]]
+name = "dotenv"
+version = "0.15.0"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "77c90badedccf4105eca100756a0b1289e191f6fcbdadd3cee1d2f614f97da8f"
+
 [[package]]
 name = "dotenvy"
 version = "0.15.7"
@@ -1079,6 +1085,7 @@ version = "0.1.0"
 dependencies = [
  "anyhow",
  "axum",
+ "dotenv",
  "serde",
  "serde_json",
  "sqlx",