hotfix: only delete recipe relations that are being updated

CRITICAL BUG FIX:
- Change PUT /recipes/:id to only delete relations present in request
- Prevents deleting ingredients/instructions when only updating tags
- Fixes production bug where adding quick tags removed all recipe content
- Makes update endpoint behave like PATCH for nested relations

This was causing all ingredients and instructions to disappear
when adding tags via the quick tag feature.

packages/api/src/routes/recipes.routes.ts

@@ -363,11 +363,19 @@ router.put('/:id', async (req, res) => {
   try {
     const { sections, ingredients, instructions, tags, ...recipeData } = req.body;
 
-    // Delete existing relations
-    await prisma.recipeSection.deleteMany({ where: { recipeId: req.params.id } });
-    await prisma.ingredient.deleteMany({ where: { recipeId: req.params.id } });
-    await prisma.instruction.deleteMany({ where: { recipeId: req.params.id } });
-    await prisma.recipeTag.deleteMany({ where: { recipeId: req.params.id } });
+    // Only delete relations that are being updated (not undefined)
+    if (sections !== undefined) {
+      await prisma.recipeSection.deleteMany({ where: { recipeId: req.params.id } });
+    }
+    if (ingredients !== undefined) {
+      await prisma.ingredient.deleteMany({ where: { recipeId: req.params.id } });
+    }
+    if (instructions !== undefined) {
+      await prisma.instruction.deleteMany({ where: { recipeId: req.params.id } });
+    }
+    if (tags !== undefined) {
+      await prisma.recipeTag.deleteMany({ where: { recipeId: req.params.id } });
+    }
 
     // Helper to clean IDs from nested data
     const cleanIngredient = (ing: any, index: number) => ({