feat: add host editing endpoint and frontend UI

crates/pm-worker/src/email.rs

@@ -9,7 +9,6 @@ use lettre::{
     transport::smtp::authentication::Credentials,
     AsyncSmtpTransport, AsyncTransport, Message, Tokio1Executor,
 };
-use serde_json;
 use sqlx::PgPool;
 
 use pm_core::audit::{log_event, AuditAction};
@@ -290,6 +289,7 @@ pub async fn send_job_completion_email(
 }
 
 /// Send a maintenance window reminder email.
+#[allow(dead_code)]
 pub async fn send_maintenance_window_reminder_email(
     pool: &PgPool,
     host_fqdn: &str,

crates/pm-worker/src/health_check_poller.rs

@@ -22,6 +22,7 @@ use pm_agent_client::{AgentClient, AgentClientError};
 
 /// Row fetched for each enabled health check, joined with host connection info.
 #[derive(FromRow)]
+#[allow(dead_code)]
 struct HealthCheckRow {
     id: Uuid,
     host_id: Uuid,

crates/pm-worker/src/maintenance_scheduler.rs

@@ -45,6 +45,7 @@ struct AutoApplyWindow {
 }
 
 #[derive(Debug, FromRow)]
+#[allow(dead_code)]
 struct PendingPatchHost {
     host_id: Uuid,
     patch_count: i32,