chore: replace placeholder package with role-named workspace

Cargo.toml

@@ -1,6 +1,24 @@
-[package]
-name = "biggus-dickus"
-version = "0.1.0"
-edition = "2024"
+[workspace]
+resolver = "3"
+members = ["crates/domain", "crates/db", "crates/api", "crates/server"]
 
-[dependencies]
+[workspace.package]
+edition = "2024"
+rust-version = "1.85"
+
+[workspace.dependencies]
+tokio = { version = "1", features = ["full"] }
+axum = "0.8"
+sqlx = { version = "0.8", features = ["runtime-tokio", "tls-rustls", "postgres", "uuid", "macros"] }
+uuid = { version = "1", features = ["v4", "serde"] }
+serde = { version = "1", features = ["derive"] }
+serde_json = "1"
+clap = { version = "4", features = ["derive", "env"] }
+utoipa = { version = "5", features = ["uuid"] }
+anyhow = "1"
+thiserror = "2"
+tracing = "0.1"
+tracing-subscriber = { version = "0.3", features = ["env-filter"] }
+tower = { version = "0.5", features = ["util"] }
+http-body-util = "0.1"
+reqwest = { version = "0.12", default-features = false, features = ["json", "rustls-tls"] }