Add SNMP v2c probing and results endpoint.

Probe sysName/sysDescr/sysObjectID for alive hosts, persist SNMP outcomes, and expose scan SNMP data via REST.

Made-with: Cursor

internal/store/sql/001_init.sql

@@ -40,3 +40,18 @@ create table if not exists scan_ports (
 
 create index if not exists idx_scan_ports_scan_id_checked_at
   on scan_ports (scan_id, checked_at desc);
+
+create table if not exists scan_snmp (
+  id bigserial primary key,
+  scan_id text not null references scan_jobs(id) on delete cascade,
+  ip inet not null,
+  success boolean not null,
+  sys_name text null,
+  sys_descr text null,
+  sys_object_id text null,
+  error_text text null,
+  checked_at timestamptz not null
+);
+
+create index if not exists idx_scan_snmp_scan_id_checked_at
+  on scan_snmp (scan_id, checked_at desc);