Add IPv6 fallback display for findings without IPv4

Findings with no IPv4 address now display Qualys IPv6 or Primary IPv6 as
fallback in the IP column, with a badge indicator:
  - 'Q' (amber) = Qualys IPv6 from hostAdditionalDetails
  - 'v6' (indigo) = Primary IPv6 from assetCustomAttributes

Priority: IPv4 > Qualys IPv6 > Primary IPv6

Backend changes:
- extractFinding now captures qualysIpv6 and primaryIpv6
- New extractQualysIpv6 helper parses hostAdditionalDetails
- upsertFindingsBatch stores both fields
- API response includes qualysIpv6 and primaryIpv6
- Migration adds qualys_ipv6 and primary_ipv6 columns

The Qualys IPv6 is preferred over Primary IPv6 because it resolves in CARD
(confirmed via testing with PMADEV-1).

backend/routes/ivantiFindings.js

@@ -89,6 +89,22 @@ const CLOSED_COUNT_FILTERS = [
     }
 ];
 
+// ---------------------------------------------------------------------------
+// Extract Qualys IPv6 address from hostAdditionalDetails
+// Looks for "IPv6 Address" (string) or "IPv6 Addresses" (array) fields
+// in the scanner-specific details from Qualys.
+// ---------------------------------------------------------------------------
+function extractQualysIpv6(f) {
+    const details = f.hostAdditionalDetails || [];
+    for (const entry of details) {
+        if (entry['IPv6 Address']) return entry['IPv6 Address'];
+        if (Array.isArray(entry['IPv6 Addresses']) && entry['IPv6 Addresses'].length > 0) {
+            return entry['IPv6 Addresses'][0];
+        }
+    }
+    return '';
+}
+
 // ---------------------------------------------------------------------------
 // Extract only the fields we need from a raw finding object
 // ---------------------------------------------------------------------------
@@ -149,7 +165,10 @@ function extractFinding(f) {
         lastFoundOn: f.lastFoundOn || '',
         buOwnership,
         cves,
-        workflow
+        workflow,
+        // IPv6 fallbacks for findings with no IPv4
+        qualysIpv6: extractQualysIpv6(f),
+        primaryIpv6: f.assetCustomAttributes?.['1550_host_6']?.[0] || '',
     };
 }
 
@@ -186,7 +205,7 @@ async function upsertFindingsBatch(findings, state) {
         const placeholders = [];
 
         batch.forEach((f, idx) => {
-            const offset = idx * 18;
+            const offset = idx * 20;
             values.push(
                 f.id,
                 f.hostId,
@@ -205,13 +224,15 @@ async function upsertFindingsBatch(findings, state) {
                 f.workflow ? f.workflow.id : null,
                 f.workflow ? f.workflow.state : null,
                 f.workflow ? f.workflow.type : null,
-                state
+                state,
+                f.qualysIpv6 || null,
+                f.primaryIpv6 || null
             );
             placeholders.push(
                 `($${offset+1}, $${offset+2}, $${offset+3}, $${offset+4}, $${offset+5}, ` +
                 `$${offset+6}, $${offset+7}, $${offset+8}, $${offset+9}, $${offset+10}, ` +
                 `$${offset+11}, $${offset+12}, $${offset+13}, $${offset+14}, $${offset+15}, ` +
-                `$${offset+16}, $${offset+17}, $${offset+18})`
+                `$${offset+16}, $${offset+17}, $${offset+18}, $${offset+19}, $${offset+20})`
             );
         });
 
@@ -220,7 +241,8 @@ async function upsertFindingsBatch(findings, state) {
                 id, host_id, title, severity, vrr_group,
                 host_name, ip_address, dns, status, sla_status,
                 due_date, last_found_on, bu_ownership, cves,
-                workflow_id, workflow_state, workflow_type, state
+                workflow_id, workflow_state, workflow_type, state,
+                qualys_ipv6, primary_ipv6
             )
             VALUES ${placeholders.join(', ')}
             ON CONFLICT (id) DO UPDATE SET
@@ -241,6 +263,8 @@ async function upsertFindingsBatch(findings, state) {
                 workflow_state = EXCLUDED.workflow_state,
                 workflow_type = EXCLUDED.workflow_type,
                 state = EXCLUDED.state,
+                qualys_ipv6 = EXCLUDED.qualys_ipv6,
+                primary_ipv6 = EXCLUDED.primary_ipv6,
                 synced_at = NOW()
         `, values);
     }
@@ -1052,6 +1076,8 @@ function createIvantiFindingsRouter(db, requireAuth) {
                 cves: row.cves || [],
                 workflow: row.workflow_id ? { id: row.workflow_id, state: row.workflow_state, type: row.workflow_type } : null,
                 note: row.note || '',
+                qualysIpv6: row.qualys_ipv6 || null,
+                primaryIpv6: row.primary_ipv6 || null,
                 overrides: {
                     ...(row.override_host_name ? { hostName: row.override_host_name } : {}),
                     ...(row.override_dns ? { dns: row.override_dns } : {})
@@ -1108,6 +1134,8 @@ function createIvantiFindingsRouter(db, requireAuth) {
                 cves: row.cves || [],
                 workflow: row.workflow_id ? { id: row.workflow_id, state: row.workflow_state, type: row.workflow_type } : null,
                 note: row.note || '',
+                qualysIpv6: row.qualys_ipv6 || null,
+                primaryIpv6: row.primary_ipv6 || null,
                 overrides: {
                     ...(row.override_host_name ? { hostName: row.override_host_name } : {}),
                     ...(row.override_dns ? { dns: row.override_dns } : {})