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>

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

@@ -176,6 +176,20 @@
       "when": 1783623700772,
       "tag": "0024_moaning_roughhouse",
       "breakpoints": true
+    },
+    {
+      "idx": 25,
+      "version": "7",
+      "when": 1783661174093,
+      "tag": "0025_wonderful_micromacro",
+      "breakpoints": true
+    },
+    {
+      "idx": 26,
+      "version": "7",
+      "when": 1783661460616,
+      "tag": "0026_sharp_rictor",
+      "breakpoints": true
     }
   ]
 }