feat(tools): converge two-tier Quick/Pro selector onto .no fork

Port the dobetterlegal-tools two-tier quality stack to dobetternorge.no:
QUALITY_TIERS registry + resolveTier (ToolModels), dbnToolsResolveToolRun
(bootstrap), tier read+charge in the 6 analytical endpoints, Quick/Pro
UI + payload.tier on the 6 tool pages/JS, and the bounded
corpusContextForSummarize RAG fix (per-passage trim + total budget +
reranker_enabled). Back-compat: requests without `tier` keep legacy
engine behavior.

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

assets/js/discrepancy.js

@@ -49,7 +49,7 @@
       results:         document.getElementById('dcResults'),
       traceList:       document.getElementById('traceList'),
       langButtons:     Array.from(document.querySelectorAll('#dcLangSwitcher .lang-btn')),
-      engineRadios:    Array.from(document.querySelectorAll('input[name="dcEngine"]')),
+      tierRadios:      Array.from(document.querySelectorAll('input[name="dcTier"]')),
       slices:          Array.from(document.querySelectorAll('.adv-slice')),
       // File A
       zoneA:           document.getElementById('dcZoneA'),
@@ -188,12 +188,10 @@
       return;
     }
 
-    const engine = (els.engineRadios.find((r) => r.checked) || {}).value || 'azure_mini';
+    const tier = (els.tierRadios.find((r) => r.checked) || {}).value || 'quick';
     const slices = getSelectedSlices();
 
-    const expectedDuration = engine === 'azure_full' ? '2-3 minutes'
-                           : engine === 'gpu'        ? '~90 seconds'
-                           : '60-90 seconds';
+    const expectedDuration = tier === 'pro' ? '2-3 minutes' : '60-90 seconds';
 
     setStatus(`Comparing documents… (${expectedDuration})`, 'busy');
     els.runButton.disabled = true;
@@ -203,7 +201,7 @@
     renderTrace(stepState);
 
     const payload = {
-      engine, language: lang, slices,
+      tier, language: lang, slices,
       use_my_case: (typeof window.dbnGetUseMyCase === 'function') ? window.dbnGetUseMyCase() : false,
     };
     const form = new FormData();