Src, move out of ./rust, add missing wip files

Moves file contents out of ./rust since I'm planning to go with rust for
the backend and the lexicons will be used for codegen soon anyways.

I also added extra files that have been in the works that I have been
accidentally sprinkling into main.rs already. God forbid I need to
cherry-pick anything from so far back in the history.

It will make git blame ugly though.

Cargo.toml

@@ -0,0 +1,21 @@
+[package]
+name = "rust"
+version = "0.1.0"
+edition = "2021"
+
+# See more keys and their definitions at https://doc.rust-lang.org/cargo/reference/manifest.html
+
+[dependencies]
+atrium-api = { version = "0.25.2", default-features = false }
+axum = { version = "0.8.3", features = ["json"] }
+axum-macros = "0.5.0"
+http = "1.3.1"
+regex = "1.11.1"
+rocketman = "0.2.0"
+serde = "1.0.219"
+serde_json = "1.0.140"
+sqlx = { version = "0.8.5", features = ["postgres", "runtime-tokio"] }
+tokio = { version = "1.44.2", features = ["macros", "rt-multi-thread"] }
+
+[build-dependencies]
+esquema-codegen = { git = "https://github.com/fatfingers23/esquema.git", branch = "main" }