rewire bootstrap with SQLite, HTTP API, and real polling

bootstrap: SQLite config, HTTP API on :3000, TCP on :2699, poll loops.
http-api: added serve() so bootstrap doesn't depend on axum directly.
polling: reads data sources from config, polls via http-json adapter,
pushes changed widgets to connected clients.

configure via API, e.g.:
  curl -X POST localhost:3000/api/data-sources -H 'Content-Type: application/json' -d '{...}'
  curl -X PUT localhost:3000/api/layout -H 'Content-Type: application/json' -d '{...}'

crates/bootstrap/Cargo.toml

@@ -5,8 +5,10 @@ edition = "2024"
 
 [dependencies]
 domain.workspace = true
-protocol.workspace = true
 application.workspace = true
-config-memory.workspace = true
+config-sqlite.workspace = true
 tcp-server.workspace = true
+http-api.workspace = true
+http-json.workspace = true
 tokio.workspace = true
+anyhow.workspace = true