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>

api/korrespond.php

@@ -173,7 +173,7 @@ try {
         $ftUid  = dbnToolsFreeTierCheck('korrespond');
         $engine = ToolModels::engineForUser($ftUid, 'azure_mini');
         $inputEngine = (string)($input['engine'] ?? '');
-        if (in_array($inputEngine, ['azure_mini', 'claude_sonnet'], true)) {
+        if (in_array($inputEngine, ['azure_mini', 'claude_haiku', 'claude_sonnet'], true)) {
             $engine = $inputEngine;
         }
         $run = ['credits' => null, 'metadata' => []];