Add TCP port scan persistence and API endpoint.

Probe configured ports for alive hosts, persist port states, and expose scan port results via REST.

Made-with: Cursor

internal/store/sql/001_init.sql

@@ -28,3 +28,15 @@ create table if not exists scan_hosts (
 
 create index if not exists idx_scan_hosts_scan_id_checked_at
   on scan_hosts (scan_id, checked_at desc);
+
+create table if not exists scan_ports (
+  id bigserial primary key,
+  scan_id text not null references scan_jobs(id) on delete cascade,
+  ip inet not null,
+  port int not null,
+  is_open boolean not null,
+  checked_at timestamptz not null
+);
+
+create index if not exists idx_scan_ports_scan_id_checked_at
+  on scan_ports (scan_id, checked_at desc);