feat(tools): reposition as Do Better Legal two-track Norwegian-law MCP

De-family-ify shared JSON tools (persona-aware routing + neutral base
prompt), make the verification review pick its engine per track
(family/child-welfare -> dbn-legal-agent-v3, others -> gpt-4o interim),
and route product-name strings through dbnToolsProductName(). Rebrand the
MCP/tools surface (mcp.php + i18n mcp_* strings) to Do Better Legal.

Co-Authored-By: Claude Opus 4.7 <noreply@anthropic.com>

includes/DiscrepancyAgent.php

@@ -803,9 +803,10 @@ PROMPT;
         $docTypeB  = $metaB['doc_type'] ?? $nameB;
         $docDateB  = $metaB['doc_date'] ?? '?';
         $authority = $metaA['issuing_authority'] ?? $metaB['issuing_authority'] ?? 'the authority';
+        $product   = dbnToolsProductName();
 
         $prompt = <<<PROMPT
-You are Do Better Norge Legal Tools evaluating discrepancies between two Barnevernet document versions.
+You are {$product} Tools evaluating discrepancies between two Barnevernet document versions.
 
 HALLUCINATION RULES:
 - Only cite statute sections (§), ECHR articles, and case names that appear verbatim in the corpus sources below.
@@ -1040,7 +1041,7 @@ PROMPT;
             dbnToolsAbort('The family-legal corpus package is not active.', 503, 'package_unavailable');
         }
         if (!dbnToolsHasActiveSubscription($clientId, (int)$package['id'])) {
-            dbnToolsAbort('Do Better Norge does not have an active family-legal subscription.', 503, 'subscription_missing');
+            dbnToolsAbort(dbnToolsProductName() . ' does not have an active family-legal subscription.', 503, 'subscription_missing');
         }
         return $package;
     }