feat(tools): persona-driven multi-domain corpus + model routing

Generalize the family-locked legal tools into caveauAI persona profiles
(client 57 chat profiles, resolved in-process via the chat_profiles bridge).
Each tool accepts an optional `profile` slug that scopes the corpus package(s),
search method, system prompt and synthesis model; omitting it falls back to the
family-legal package so existing behaviour is unchanged.

- dbnToolsResolvePersona / dbnToolsListPersonas / dbnToolsBootChatProfiles in
  bootstrap.php; new api/personas.php + dbn.list_personas MCP tool.
- LegalTools search/ask/corpusContextForSummarize and the BvjAnalyzer /
  LegalAnalysis / translate paths take the persona's packages + prompt + model.
- Persona <select> on ask/search/summarize (populated from api/personas.php).

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

api/summarize.php

@@ -51,7 +51,10 @@ try {
         ]);
         $svc           = new DbnLegalToolsService();
         $query         = mb_substr(trim($text), 0, 600, 'UTF-8');
-        $corpusContext = $svc->corpusContextForSummarize($query, 8);
+        $persona       = (isset($input['profile']) && is_string($input['profile']) && trim($input['profile']) !== '')
+            ? trim($input['profile'])
+            : null;
+        $corpusContext = $svc->corpusContextForSummarize($query, 8, $persona);
         $emit('progress', [
             'step'   => 'corpus_done',
             'detail' => $corpusContext !== ''