feat: add batch-cooking sessions (single "mega recipe" with dish sections)

New AI-generated batch-cooking flow: pick N dinners/lunches + servings,
get one unified recipe covering a full prep session — merged shopping
list, steps tagged per-dish (a step can advance several dishes at once,
e.g. a shared oven bake), and per-dish storage (fridge/freezer) + exact
day-of reheat/finishing instructions.

Schema: recipes.isBatchCook, recipeSteps.appliesTo (dish names), new
recipeBatchDishes table. Batch recipes are excluded from the normal
/recipes list and live under their own /batch-cooking section.

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

packages/db/src/migrations/0029_tired_crystal.sql

@@ -0,0 +1,17 @@
+CREATE TABLE "recipe_batch_dishes" (
+	"id" text PRIMARY KEY NOT NULL,
+	"recipe_id" text NOT NULL,
+	"name" text NOT NULL,
+	"description" text,
+	"order" integer DEFAULT 0 NOT NULL,
+	"fridge_days" integer NOT NULL,
+	"freezer_friendly" boolean DEFAULT false NOT NULL,
+	"freezer_note" text,
+	"day_of_instructions" text NOT NULL
+);
+--> statement-breakpoint
+ALTER TABLE "recipe_steps" ADD COLUMN "applies_to" text[] DEFAULT '{}' NOT NULL;--> statement-breakpoint
+ALTER TABLE "recipes" ADD COLUMN "is_batch_cook" boolean DEFAULT false NOT NULL;--> statement-breakpoint
+ALTER TABLE "recipe_batch_dishes" ADD CONSTRAINT "recipe_batch_dishes_recipe_id_recipes_id_fk" FOREIGN KEY ("recipe_id") REFERENCES "public"."recipes"("id") ON DELETE cascade ON UPDATE no action;--> statement-breakpoint
+CREATE INDEX "recipe_batch_dishes_recipe_idx" ON "recipe_batch_dishes" USING btree ("recipe_id");--> statement-breakpoint
+CREATE INDEX "recipes_batch_cook_idx" ON "recipes" USING btree ("is_batch_cook");

packages/db/src/migrations/meta/_journal.json

@@ -204,6 +204,13 @@
       "when": 1783671061049,
       "tag": "0028_smiling_ezekiel_stane",
       "breakpoints": true
+    },
+    {
+      "idx": 29,
+      "version": "7",
+      "when": 1783810665920,
+      "tag": "0029_tired_crystal",
+      "breakpoints": true
     }
   ]
 }