Add monetization spine + Build Your Own Case (Min Sak)

- Stripe: StripeClient.php, checkout/portal/webhook endpoints, idempotent event handling
- FreeTier: tier-aware credits (free/light/pro/pro_plus), bonus_balance, hourly caps per tier
- pricing.php + billing.php: 4-tier cards, 3 topups, Customer Portal, balance breakdown
- Min Sak: CaseStore.php, AzureDocIntelligence.php, AzureSearchAdmin.php — per-user hybrid RAG
- api/case/: upload, list, delete, ingest-callback (HMAC-auth'd from n8n)
- award-survey-credits: inter-site HMAC endpoint for dobetternorge.no survey bonus
- dashboard.php: tier badge, balance breakdown card, Min Sak CTA, survey CTA
- KorrespondAgent + all 3 other agents: use_my_case toggle wired to dbnToolsCaseContext()
- bootstrap.php: dbnToolsCaseContext(), dbnToolsIntersiteSecret(), dbnToolsCurrentTier()

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

deep-research.php

@@ -21,8 +21,9 @@ require_once __DIR__ . '/includes/layout.php';
                         <label><input type="radio" name="drEngine" value="azure_mini" checked> Azure gpt-4o-mini &#9733; <small class="control-hint">(~15-45s)</small></label>
                         <label><input type="radio" name="drEngine" value="azure_full"> Azure gpt-4o <small class="control-hint">(best · ~60-180s)</small></label>
                         <label><input type="radio" name="drEngine" value="gpu"> GPU (cuttlefish) <small class="control-hint">(local · ~30-90s)</small></label>
+                        <label><input type="radio" name="drEngine" value="dbn_legal_v3"> &#x1F1F3;&#x1F1F4; Norwegian specialist v3 &#9733; <small class="control-hint">(dbn-legal-agent-v3 · ~20-60s)</small></label>
                     </div>
-                    <p class="upload-hint">Azure mini is the default and finishes fastest. Azure full is the most thorough but can take 1-3 minutes. GPU keeps everything inside the BNL fleet. Live progress shown in the right-hand reasoning panel.</p>
+                    <p class="upload-hint">Azure mini is the default and finishes fastest. Azure full is the most thorough. Norwegian specialist v3 is a Qwen2.5 fine-tune optimised for barnevernsloven, ECHR, and forvaltningsloven — best for cases involving § 4-25, Strand Lobben, or procedural challenges.</p>
 
                     <div class="dr-slice-section">
                         <p class="control-label">Corpus slices</p>