Keep recipe_url out of dinner responses (Feature 12 review F1)

A pasted recipe link may carry a personal token in its query, and the
dinners API returned it from create, list, get, patch and ground, where
other household clients and the PWA's cache of dinner reads could keep
it. Drop recipe_url from the public Dinner shape so it stays in the
database for grounding and dedupe only.

TestCreateDinnerByURL and TestCreateDinnerByName now assert the field is
absent; TestDinnerResponsesHideRecipeURL creates a Regular from a
token-bearing link and checks neither the create nor the list response
holds the link, host or token while the stored link remains.

Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com>

internal/dinners/dinners.go

@@ -55,7 +55,9 @@ var listable = []string{StatusRegular, StatusQuestLog}
 // ErrNotFound is returned for an unknown dinner id.
 var ErrNotFound = errors.New("dinner not found")
 
-// Dinner is a dinner as the API shows it.
+// Dinner is a dinner as the API shows it. It has no recipe_url: a pasted
+// link may carry a personal token, so it stays in the database for
+// grounding and never leaves the server.
 type Dinner struct {
 	ID              string  `json:"id"`
 	Name            string  `json:"name"`
@@ -67,7 +69,6 @@ type Dinner struct {
 	Cuisine         *string `json:"cuisine"`
 	IsFavorite      bool    `json:"is_favorite"`
 	RecipeID        *string `json:"recipe_id"`
-	RecipeURL       *string `json:"recipe_url"`
 	PhotoURL        *string `json:"photo_url"`
 	GroundingStatus string  `json:"grounding_status"`
 	// GroundingError is why grounding failed, one of the Reason codes;
@@ -565,7 +566,6 @@ func fromRow(r db.Dinner) Dinner {
 		Cuisine:         nullString(r.Cuisine),
 		IsFavorite:      r.IsFavorite == 1,
 		RecipeID:        nullString(r.RecipeID),
-		RecipeURL:       nullString(r.RecipeUrl),
 		GroundingStatus: r.GroundingStatus,
 		GroundingError:  nullString(r.GroundingError),
 		UpdatedBy:       nullString(r.UpdatedBy),

internal/dinners/grounding_test.go

@@ -383,8 +383,11 @@ func TestRenameLinkWhilePendingGroundsNewName(t *testing.T) {
 	if err != nil {
 		t.Fatal(err)
 	}
-	if d.GroundingStatus != dinners.GroundingPending || d.RecipeURL != nil {
-		t.Fatalf("renamed = %+v, want still pending with no recipe_url", d)
+	if d.GroundingStatus != dinners.GroundingPending {
+		t.Fatalf("renamed = %+v, want still pending", d)
+	}
+	if row, err := db.New(e.st.Reader).GetDinner(t.Context(), c.ID); err != nil || row.RecipeUrl.Valid {
+		t.Fatalf("renamed row = %+v (err %v), want no recipe_url", row, err)
 	}
 	e.start(t)
 
@@ -749,12 +752,15 @@ func TestFixReplacesPendingLink(t *testing.T) {
 				t.Fatal(err)
 			}
 			e.model.QueueGenerate(recipestest.NormalizedReply("stovetop", 25))
-			d, err := e.svc.Ground(t.Context(), c.ID, tt.fix, member)
+			if _, err := e.svc.Ground(t.Context(), c.ID, tt.fix, member); err != nil {
+				t.Fatal(err)
+			}
+			row, err := db.New(e.st.Reader).GetDinner(t.Context(), c.ID)
 			if err != nil {
 				t.Fatal(err)
 			}
-			if d.RecipeURL != nil {
-				t.Errorf("recipe_url = %q after the fix, want the unusable link dropped", *d.RecipeURL)
+			if row.RecipeUrl.Valid {
+				t.Errorf("recipe_url = %q after the fix, want the unusable link dropped", row.RecipeUrl.String)
 			}
 
 			if _, err := e.svc.CreateRegular(t.Context(), dinners.NewRegular{RecipeURL: ptr(lost)}, member); err != nil {