Add Legal Analysis tool — two-pass DBN-legal pipeline

Restores the dbn-legal-agent-v3 fine-tune on ocelot (was silently aliased
to plain qwen2.5:14b in LiteLLM since the viper retirement) and ships a
new tool that uses it via a two-pass flow:

  Pass 1 (Azure 4o-mini)  → extract up to 5 distinct legal issues
  Pass 2 (ocelot v3 only) → answer each issue, ≤350 tokens, with corpus
  Pass 3 (Azure 4o-mini)  → synthesise overall assessment + next steps

The 12GB-VRAM constraint motivates the split: dbn-legal-agent-v3 stays
hot in VRAM through the 5 sequential per-issue calls because issue
extraction and synthesis run on Azure, not on ocelot.

New surface:
  - includes/LegalAnalysisAgent.php
  - api/legal-analysis.php           (NDJSON streaming endpoint)
  - legal-analysis.php               (dedicated tool page)
  - assets/js/legal-analysis.js      (streamed UI with per-issue cards)
  - Save-result + case-result.php rendering for legal-analysis output
  - Nav registration in all four UI languages

Add-on integration: a "⚖️🇳🇴 Run deep legal analysis on this text"
button now appears on Summarize, Ask, and Redact result pages and
streams the same pipeline inline below the existing result.

Existing tools relabelled: the misleading "🇳🇴 Norwegian specialist v3 ⭐"
option on advocate/deep-research/discrepancy/barnevernet is now honestly
"DBN Legal Agent" — now that the real fine-tune is actually deployed,
the label finally matches reality. The advocate.php v2 option was
removed since the v2 GGUF is retired.

Co-Authored-By: Claude Sonnet 4.6 <noreply@anthropic.com>

assets/js/summarize.js

@@ -229,6 +229,13 @@
                                 resultsEl
                             );
                         }
+                        // Offer deep legal analysis on the summarised text
+                        if (typeof window.dbnInjectLegalAnalysisButton === 'function') {
+                            var sourceText = combined || (_lastPayload && _lastPayload.text) || '';
+                            if (sourceText && sourceText.length >= 80) {
+                                window.dbnInjectLegalAnalysisButton(sourceText, _currentLang, 'summarize', resultsEl);
+                            }
+                        }
                         if (data.balance != null) {
                             var credEl = document.getElementById('creditsRemaining');
                             if (credEl) credEl.textContent = data.balance;