fix: photo import language + no-recipe-recognized handling (v0.29.0)

importFromPhoto() accepted a locale param but silently discarded it
(named _locale, never read) — now builds a language instruction the
same way generate-recipe.ts does for text generation.

The AI output schema had no way to signal "couldn't find a recipe in
this image" — generateObject would always fabricate a title/fields.
Added a `found` boolean the model sets to false in that case; the
route now returns 422 instead of creating a garbage recipe and
sending the user into the editor with it.

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

apps/web/lib/ai/features/import-photo.ts

@@ -4,6 +4,7 @@ import { resolveModel, type AiConfig } from "../factory";
 import { dietaryTagsSchema, ingredientSchema, stepSchema } from "./recipe-schema";
 
 const ImportedRecipeSchema = z.object({
+  found: z.boolean().describe("false if the image does not contain a recognizable recipe (e.g. random photo, no visible ingredients/instructions)"),
   title: z.string(),
   description: z.string().optional(),
   baseServings: z.number().int().min(1).optional(),
@@ -17,19 +18,23 @@ const ImportedRecipeSchema = z.object({
 
 export type ImportedRecipe = z.infer<typeof ImportedRecipeSchema>;
 
+const LANG: Record<string, string> = { en: "English", fr: "French" };
+
 export async function importFromPhoto(
   imageBase64: string,
   mimeType: "image/jpeg" | "image/png" | "image/webp",
   config?: AiConfig,
-  _locale?: string,
+  locale?: string,
 ): Promise<ImportedRecipe> {
   const model = resolveModel(config);
+  const lang = LANG[locale ?? "en"] ?? "English";
+  const langInstruction = lang !== "English" ? ` Write the entire recipe (title, description, ingredient names, step instructions) in ${lang}, regardless of the language used in the image.` : "";
 
   const { object } = await generateObject({
     model,
     schema: ImportedRecipeSchema,
     system:
-      "You are a recipe extraction specialist. Extract the complete recipe from the provided image. Be precise with ingredient quantities and cooking instructions.",
+      `You are a recipe extraction specialist. Extract the complete recipe from the provided image. Be precise with ingredient quantities and cooking instructions. If the image does not contain a recognizable recipe (no visible ingredients or cooking instructions), set found to false and leave the other fields minimal/empty.${langInstruction}`,
     messages: [
       {
         role: "user",