feat: initial commit

Axum/Postgres server with auth, migrations, and Docker setup.

src/handlers/mod.rs

@@ -0,0 +1,17 @@
+use axum::http::StatusCode;
+
+pub mod attachment;
+pub mod auth;
+pub mod auth_token;
+pub mod conversation;
+pub mod conversation_member;
+pub mod message;
+pub mod reaction;
+pub mod user;
+pub mod workspace;
+pub mod workspace_invitation;
+pub mod workspace_member;
+
+pub(crate) fn db_err(e: sqlx::Error) -> (StatusCode, String) {
+    (StatusCode::INTERNAL_SERVER_ERROR, e.to_string())
+}