Add phase 4: AI cleanup and photo/text import via OpenAI

- recipes/ai.py: Chat Completions with strict JSON schema (Structured
  Outputs), Pydantic re-validation, plausibility clamping, prompt treats
  input as data only
- "Mit KI aufbereiten" on create/edit form returns an editable draft
- Import page: photo/screenshot (vision, downscaled JPEG, not stored) and
  pasted text; drafts pre-fill the recipe form with a preview
- Clear UI messages for timeout, rate limit, quota, auth, model and
  connection errors; without OPENAI_API_KEY AI features show a notice
- Optional per-user and global daily AI limits (default unlimited)
- Tests for response parsing, schema strictness, error mapping, views

Co-Authored-By: Claude Opus 5.5 <[email protected]>

recipes/views.py

@@ -14,7 +14,7 @@ from django.views.decorators.http import require_GET, require_POST
 
 from core import ratelimit
 
-from . import images
+from . import ai, images
 from .forms import CommentForm, PhotoUploadForm, RecipeForm, SearchForm
 from .models import Comment, Favorite, Recipe, RecipeImage, Tag
 
@@ -99,25 +99,48 @@ def _render_detail(request, recipe, comment_form=None, status=200):
     }, status=status)
 
 
+def _render_form(request, form, recipe=None, **extra):
+    context = {"form": form, "is_new": recipe is None, "recipe": recipe,
+               "images": recipe.images.all() if recipe else [], **extra}
+    return render(request, "recipes/form.html", context)
+
+
+def _ai_cleanup(request, recipe=None):
+    """'Mit KI aufbereiten' on the manual form: replace the fields with an AI draft (not saved)."""
+    data = request.POST
+    try:
+        draft = ai.structure_text(request.user, ai.form_text_for_ai(data))
+    except ai.AIError as error:
+        messages.error(request, error.user_message)
+        return _render_form(request, RecipeForm(initial=data.dict(), instance=recipe), recipe)
+    keep = {key: data.get(key, "") for key in ("visibility", "source_url") if data.get(key)}
+    form = RecipeForm(initial={**draft.to_form_initial(), **keep}, instance=recipe)
+    return _render_form(request, form, recipe, ai_draft=draft)
+
+
 def recipe_create(request):
+    if request.method == "POST" and "ai" in request.POST:
+        return _ai_cleanup(request)
     form = RecipeForm(request.POST or None, request.FILES or None)
     if request.method == "POST" and form.is_valid():
         recipe = form.save(owner=request.user)
         attach_photos(request, recipe, form.cleaned_data.get("photos") or [])
         messages.success(request, "Rezept gespeichert.")
         return redirect("recipes:detail", pk=recipe.pk)
-    return render(request, "recipes/form.html", {"form": form, "is_new": True})
+    return _render_form(request, form)
 
 
 def recipe_edit(request, pk):
     recipe = get_object_or_404(Recipe.objects.editable_by(request.user), pk=pk)
+    if request.method == "POST" and "ai" in request.POST:
+        return _ai_cleanup(request, recipe)
     form = RecipeForm(request.POST or None, request.FILES or None, instance=recipe)
     if request.method == "POST" and form.is_valid():
         recipe = form.save()
         attach_photos(request, recipe, form.cleaned_data.get("photos") or [])
         messages.success(request, "Änderungen gespeichert.")
         return redirect("recipes:detail", pk=recipe.pk)
-    return render(request, "recipes/form.html", {"form": form, "recipe": recipe, "images": recipe.images.all()})
+    return _render_form(request, form, recipe)
 
 
 def recipe_delete(request, pk):