Exclude leads sharing a WhatsApp number from the automatic campaign queue

candidateQuery now blocks a lead whose WhatsApp number is shared by 2+
leads, unless a shared-number override exists. The inner correlated
subquery compares the bare other.whatsapp column (not normalizedSql())
against the outer row's two computed number forms so SQLite can use
idx_leads_whatsapp instead of a full table scan, keeping the 1.3M-row
perf test within budget.

Also updates the pre-existing 'persiste erro temporario e nao repete
equivalente' test: its two leads use 8/9-digit equivalent numbers,
which the new filter now blocks by default, so an override is added
to keep exercising the intended equivalent-number dedup behavior.

src/outreach/campaign-queue.mjs

@@ -63,6 +63,15 @@ function candidateQuery(confirmed) {
          SELECT 1 FROM outreach_opt_outs opt_out
           WHERE opt_out.numero IN (${leadNumber}, ${leadEquivalent})
        )
+       AND (
+         (SELECT COUNT(DISTINCT other.id) FROM leads other
+           WHERE other.whatsapp IN (${leadNumber}, ${leadEquivalent})
+         ) < 2
+         OR EXISTS (
+           SELECT 1 FROM outreach_shared_number_overrides ov
+            WHERE ov.numero IN (${leadNumber}, ${leadEquivalent})
+         )
+       )
        AND NOT EXISTS (
          SELECT 1 FROM outreach_inbound_replies replies
           WHERE replies.lead_id = leads.id