extract background tasks into worker binary

Move auto_scheduler, library_sync, broadcast_poller, webhook_consumer
from presentation/background/ into crates/worker/src/jobs/.
Presentation is now a pure HTTP server.

Cargo.lock

@@ -1808,9 +1808,7 @@ dependencies = [
  "chrono",
  "domain",
  "dotenvy",
- "handlebars",
  "infra-wiring",
- "reqwest",
  "serde",
  "serde_json",
  "thiserror",
@@ -3369,6 +3367,31 @@ version = "0.52.6"
 source = "registry+https://github.com/rust-lang/crates.io-index"
 checksum = "589f6da84c646204747d1270a2a5661ea66ed1cced2631d546fdfb155959f9ec"
 
+[[package]]
+name = "worker"
+version = "0.1.0"
+dependencies = [
+ "adapter-auth",
+ "adapter-event-publisher",
+ "adapter-jellyfin",
+ "adapter-local-files",
+ "adapter-sqlite",
+ "anyhow",
+ "application",
+ "async-trait",
+ "chrono",
+ "domain",
+ "dotenvy",
+ "handlebars",
+ "infra-wiring",
+ "reqwest",
+ "serde_json",
+ "tokio",
+ "tracing",
+ "tracing-subscriber",
+ "uuid",
+]
+
 [[package]]
 name = "writeable"
 version = "0.6.3"