feat(worker): NotificationHandler and FederationHandler stub

crates/worker/Cargo.toml

@@ -2,3 +2,26 @@
 name = "worker"
 version = "0.1.0"
 edition = "2021"
+
+[[bin]]
+name = "thoughts-worker"
+path = "src/main.rs"
+
+[dependencies]
+domain        = { workspace = true }
+nats          = { workspace = true }
+event-payload = { workspace = true }
+postgres      = { workspace = true }
+async-nats    = { workspace = true }
+tokio         = { workspace = true, features = ["full"] }
+futures       = { workspace = true }
+async-trait   = { workspace = true }
+tracing       = { workspace = true }
+tracing-subscriber = { workspace = true }
+dotenvy       = { workspace = true }
+serde_json    = { workspace = true }
+chrono        = { workspace = true }
+sqlx          = { workspace = true }
+
+[dev-dependencies]
+domain = { workspace = true, features = ["test-helpers"] }