fix(tools): route quick/pro tiers to Haiku/Sonnet on Bedrock

Tier engine strings (claude_haiku/claude_sonnet) were stripped back to
azure_mini by per-method whitelists, so both tiers ran gpt-4o-mini and Pro
charged 2x for the same model. Add a shared DbnBedrockModelRouter::
deploymentForEngine() helper and route the cloud path through it across
summarize, ask, barnevernet, discrepancy, deep-research, and korrespond.

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

includes/DiscrepancyAgent.php

@@ -49,7 +49,7 @@ final class DbnDiscrepancyAgent
         array     $sliceSelection,
         ?callable $emit = null
     ): array {
-        $engine   = in_array($engine, ['azure_mini', 'azure_full', 'gpu'], true) ? $engine : 'azure_mini';
+        $engine   = in_array($engine, ['azure_mini', 'azure_full', 'gpu', 'claude_haiku', 'claude_sonnet'], true) ? $engine : 'azure_mini';
         $language = dbnToolsNormalizeUiLanguage($language);
 
         $textA = mb_substr((string)($fileA['text'] ?? ''), 0, self::MAX_DOC_CHARS, 'UTF-8');
@@ -754,11 +754,11 @@ PROMPT;
     ): array {
         $locale      = dbnToolsLanguageName($language);
         $sourceCount = count($numberedSources);
+        $cloudDeploy = DbnBedrockModelRouter::deploymentForEngine($engine, $this->azure instanceof DbnBedrockGateway);
         $deployLabel = match ($engine) {
             'gpu'          => 'GPU (cuttlefish)',
             'dbn_legal_v3' => 'dbn-legal-agent-v3',
-            'azure_full'   => 'gpt-4o',
-            default        => $this->azure->chatDeployment(),
+            default        => $cloudDeploy,
         };
 
         if (empty($numberedSources)) {
@@ -872,10 +872,8 @@ PROMPT;
             } elseif ($engine === 'gpu') {
                 $response = dbnToolsCallGpuLlm($messages, $opts);
                 $raw = (string)($response['choices'][0]['message']['content'] ?? '');
-            } elseif ($engine === 'azure_full') {
-                $raw = $this->azure->withDeployment('gpt-4o')->chatText($messages, $opts);
             } else {
-                $raw = $this->azure->chatText($messages, $opts);
+                $raw = $this->azure->withDeployment($cloudDeploy)->chatText($messages, $opts);
             }
         } catch (Throwable $e) {
             dbnToolsAbort('Synthesis LLM request failed: ' . $e->getMessage(), 502, 'llm_error');