refactor(portal): split hardening and kpi modules

adk-rust/crates/detmir-portal/src/production/mod.rs

@@ -0,0 +1,18 @@
+pub(crate) mod health;
+pub(crate) mod limits;
+pub(crate) mod logging;
+pub(crate) mod metrics;
+pub(crate) mod readiness;
+pub(crate) mod request_context;
+pub(crate) mod version;
+
+pub(crate) use health::build_healthz;
+pub(crate) use limits::{is_limited_api_route, validate_api_query_limits, validate_portal_config};
+pub(crate) use logging::log_http_request;
+pub(crate) use metrics::{
+    record_http_metric, record_ingestion_accepted, record_ingestion_rejected,
+    record_report_generated, render_prometheus_metrics,
+};
+pub(crate) use readiness::build_readyz;
+pub(crate) use request_context::{http_request_metadata, mark_request_started};
+pub(crate) use version::build_version;