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>

mcp.php

@@ -411,7 +411,7 @@ export DBN_MCP_TOKEN=dbn_user_mcp_...</code></pre>
     {
       "type": "promptString",
       "id": "dbn-token",
-      "description": "Do Better Norge MCP token",
+      "description": "Do Better Legal MCP token",
       "password": true
     }
   ],