Implement basic city portal logic (and severely deabstract)

- Create a podman compose for Postgres
- Implement types and tables for urban data
- No longer use a Cargo workspace as there's no point currently
- Create query functionality (not mutation yet)

Cargo.toml

@@ -3,11 +3,14 @@ name = "city_portal"
 version = "0.1.0"
 edition = "2024"
 
-[workspace.dependencies]
+[dependencies]
 tokio = { version = "1", features = ["full"] }
 axum = "0.8"
 async-graphql = "7"
 async-graphql-axum = "7"
-
-[dependencies]
-gateway = { path = "services/gateway" }
+serde = "1"
+serde_json = "1"
+sqlx = { version = "0.8", features = ["runtime-tokio", "tls-rustls-aws-lc-rs", "postgres"] }
+chrono = "0.4"
+dotenv = "0.15.0"
+anyhow = "1.0"