v0.24.0 — Garden: harvest→pantry, structured amounts, UW Extension links

Harvest logs now carry a structured amount+unit (legacy freeform quantity
kept for old rows) and can simultaneously create a GARDEN-source pantry
item via addPlantLog's new pantry input. PlantTypes can link a UW–Madison
Extension article, searched through /api/v1/plant-types/uw-search (proxy
to hort.extension.wisc.edu's WordPress REST API); the link shows on the
type page and each plant. The garden log dialog now posts to /api/v1.

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

prisma/schema.prisma

@@ -195,6 +195,8 @@ model PlantType {
   edibleParts  String?       // "Fruit, young leaves"
   spacing      String?       // "10–15 ft", "18 in"
   imageUrl     String?
+  uwExtensionUrl   String?   // linked UW–Madison Extension article (hort.extension.wisc.edu)
+  uwExtensionTitle String?   // its title, shown as the link text
   notes        String?
   active       Boolean       @default(true)
   createdAt    DateTime      @default(now())
@@ -282,7 +284,9 @@ model PlantLog {
   type      PlantLogType
   date      DateTime     @default(now())
   notes     String?
-  quantity  String?      // freeform for harvests: "2 lbs", "1 gallon", "a big handful"
+  quantity  String?      // legacy freeform harvests ("a big handful") — new logs use amount+unit
+  amount    Decimal?     @db.Decimal(10, 2) // structured harvest quantity (queryable totals)
+  unit      String?      // "lbs", "each", "quarts" — pairs with amount
   actorId   String?
   createdAt DateTime     @default(now())