webhook through event system, extract data-generators adapter

webhook route now emits WebhookDataReceived event instead of directly
mutating DataProjection and broadcasting. event_handler applies data
and pushes incremental DataUpdate.

clock/static_text generators extracted to data-generators crate behind
DataSourcePort. chrono removed from bootstrap. polling adapters grouped
into Adapters struct.

Cargo.lock

@@ -226,9 +226,8 @@ version = "0.1.0"
 dependencies = [
  "anyhow",
  "application",
- "chrono",
- "chrono-tz",
  "config-sqlite",
+ "data-generators",
  "domain",
  "dotenvy",
  "http-api",
@@ -467,6 +466,16 @@ dependencies = [
  "cipher",
 ]
 
+[[package]]
+name = "data-generators"
+version = "0.1.0"
+dependencies = [
+ "chrono",
+ "chrono-tz",
+ "domain",
+ "thiserror",
+]
+
 [[package]]
 name = "der"
 version = "0.7.10"