feat: push+email notifications, recipe notes, fork/clone, pantry-aware lists, GDPR export

Five S-sized items from HANDOFF.md's new-features backlog, all wiring up
previously-orphaned infra:

- createNotification now sends web push + email for every notification type
  (follow/comment/reply/reaction/rating/mention), not just comments
- Personal recipe notes: private per-user notes on any viewable recipe
  (recipeNotes table had zero API/UI before this)
- Recipe fork/clone: deep-copies a viewable recipe into your own library as
  a private draft, linked via recipeVariations, respects tier quota
- Pantry-aware shopping lists: meal-plan-generated lists now subtract
  on-hand pantry quantities (ingredientId match, falling back to normalized
  name match) and flag partial/ambiguous matches instead of guessing
- GDPR data export: downloadable JSON of a user's own content and activity
  across every relevant table, secrets/internal tables excluded

New migrations 0025 (unique index for recipe-notes upsert) and 0026
(shopping_list_items.in_pantry) generated, left unapplied like 0023/0024.
Verified with typecheck, lint, and a full local `docker build`.

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

apps/web/components/meal-plan/shopping-list-view.tsx

@@ -15,6 +15,7 @@ type Item = {
   unit: string | null;
   aisle: string | null;
   checked: boolean;
+  inPantry?: boolean;
 };
 
 export function ShoppingListView({
@@ -119,6 +120,11 @@ export function ShoppingListView({
                 <span className={cn("flex-1 text-sm", item.checked && "line-through text-muted-foreground")}>
                   {item.rawName}
                 </span>
+                {item.inPantry && (
+                  <span className="text-[10px] font-medium uppercase tracking-wide text-emerald-600 dark:text-emerald-400 bg-emerald-500/10 rounded px-1.5 py-0.5 shrink-0">
+                    {tShopping("alreadyInPantry")}
+                  </span>
+                )}
                 {(hasQuantity(item.quantity) || item.unit) && (
                   <span className={cn("text-xs text-muted-foreground tabular-nums shrink-0", item.checked && "opacity-50")}>
                     {hasQuantity(item.quantity) ? item.quantity : ""}{item.unit ? ` ${item.unit}` : ""}