fix: self-heal chatbot recipe requests answered as prose, not a tool call (v0.57.1)

The system prompt already told the model to MUST call createRecipe
instead of writing the recipe out — that's a soft rule some models
(especially free-tier ones) still ignore. There was no fallback: if the
model answered in prose, that's just what got returned, no draft card.

Added a detector (looksLikeUnstructuredRecipe: 3+ numbered/bulleted
lines with no tool call) and a forced-tool retry when it fires — same
system+prompt, but toolChoice forced to createRecipe so the model can't
opt out on the second pass. Falls back to a short localized line if the
provider returns no text alongside a forced tool call (some do this by
design). Retry failure just keeps the original prose answer rather than
erroring the whole request.

Co-Authored-By: Claude Sonnet 5 <noreply@anthropic.com>

CHANGELOG.md

@@ -2,6 +2,11 @@
 
 All notable changes to Epicure are documented here. This file is mirrored in-app at `/changelog` (and in the admin dashboard) via `apps/web/lib/changelog.ts` — update both together.
 
+## 0.57.1 — 2026-07-20 20:00
+
+### Fixed
+- Chatbot sometimes answered "create a recipe" requests with the recipe spelled out as prose instead of the actual draft card (weaker/free-tier models occasionally ignore the tool-calling instruction). Now detects that shape and forces one retry with the tool call required, so the draft card still appears.
+
 ## 0.57.0 — 2026-07-20 09:20
 
 ### Added