v0.13.0 — Inventory (HomeBox): durable items that nest

The first inventory vertical on the shared spine. Things you own — tools, gear,
equipment — each living in a Location or inside another Item.

- Item model (kind DURABLE|CONSUMABLE; consumable fields present but unused so
  Pantry needs no migration), self-nesting via parentItemId (toolbox holds drill,
  with a cycle guard), value/warranty/serial/brand/qty, qrSlug, photo
- Label (m2m) + ItemAttachment (photos/manuals/receipts) + ItemLog
  (maintenance/repair/move/dispose) history; Task.itemId
- API-first: /api/v1/items (CRUD), labels, logs, multipart attachments — the UI
  consumes the same scoped endpoints. items service shared with the coming MCP
- Inventory pages: tree grouped by Location with items nested inside items;
  item detail with warranty status, photos, contents, history; add/edit/delete,
  log, photo upload. Nav entry. Backup/restore cover the new tables
- Pure value.ts (warrantyStatus, totalValue) with tests; verified end-to-end
  against a running server (nest, cycle-guard 400, log 201)

Co-Authored-By: Claude Opus 4.8 (1M context) <noreply@anthropic.com>

prisma/schema.prisma

@@ -100,6 +100,7 @@ model Location {
   createdAt DateTime     @default(now())
   updatedAt DateTime     @updatedAt
   plants    Plant[]
+  items     Item[]
 
   @@index([parentId])
   @@index([kind])
@@ -236,6 +237,8 @@ model Task {
   category     TaskCategory   @default(GARDEN)
   plantId      String?
   plant        Plant?         @relation(fields: [plantId], references: [id])
+  itemId       String?
+  item         Item?          @relation(fields: [itemId], references: [id], onDelete: SetNull)
   recurrence   RecurrenceType @default(YEARLY)
   intervalDays Int?           // for CUSTOM: every N days
   month        Int?           // 1–12: for YEARLY, which month
@@ -248,6 +251,7 @@ model Task {
 
   @@index([nextDue])
   @@index([plantId])
+  @@index([itemId])
   @@index([active])
 }
 
@@ -276,3 +280,118 @@ model PlantLog {
   @@index([plantId])
   @@index([date])
 }
+
+// ---------------------------------------------------------------------------
+// Inventory — things you own. Durable items (tools, gear) and, later,
+// consumables (food, supplies) share this one table, told apart by `kind`.
+// Items nest: an Item lives in a Location OR inside another Item (toolbox →
+// drill). Consumable-only fields (barcode, bestBefore, minStock) are unused
+// by the durable UI but present so Pantry needs no schema change.
+// ---------------------------------------------------------------------------
+
+enum ItemKind {
+  DURABLE     // tools, gear, equipment — "where is it?"
+  CONSUMABLE  // food, feed, supplies — "do I have it?" (Pantry phase)
+}
+
+model Item {
+  id             String     @id @default(cuid())
+  name           String
+  description    String?
+  kind           ItemKind   @default(DURABLE)
+  quantity       Decimal    @default(1) @db.Decimal(10, 2)
+  unit           String?    // "each", "lbs", "bottles"
+
+  // Where it lives — a place, or inside another item (containers are items too).
+  locationId     String?
+  location       Location?  @relation(fields: [locationId], references: [id], onDelete: SetNull)
+  parentItemId   String?
+  parentItem     Item?      @relation("ItemNesting", fields: [parentItemId], references: [id], onDelete: SetNull)
+  containedItems Item[]     @relation("ItemNesting")
+
+  // Durable attributes
+  value          Decimal?   @db.Decimal(10, 2)
+  purchaseDate   DateTime?
+  warrantyExpiry DateTime?
+  serial         String?
+  modelNumber    String?
+  brand          String?
+
+  // Consumable attributes (Pantry phase)
+  barcode        String?
+  bestBefore     DateTime?
+  minStock       Decimal?   @db.Decimal(10, 2)
+
+  // Shared
+  qrSlug         String?    @unique // short slug for a printed QR label
+  imageUrl       String?
+  notes          String?
+  active         Boolean    @default(true)
+  createdAt      DateTime   @default(now())
+  updatedAt      DateTime   @updatedAt
+
+  labels         LabelOnItem[]
+  attachments    ItemAttachment[]
+  logs           ItemLog[]
+  tasks          Task[]
+
+  @@index([locationId])
+  @@index([parentItemId])
+  @@index([kind])
+  @@index([active])
+  @@index([name])
+  @@index([barcode])
+}
+
+model Label {
+  id    String        @id @default(cuid())
+  name  String        @unique
+  color String?
+  items LabelOnItem[]
+}
+
+model LabelOnItem {
+  itemId  String
+  labelId String
+  item    Item  @relation(fields: [itemId], references: [id], onDelete: Cascade)
+  label   Label @relation(fields: [labelId], references: [id], onDelete: Cascade)
+
+  @@id([itemId, labelId])
+  @@index([labelId])
+}
+
+model ItemAttachment {
+  id        String   @id @default(cuid())
+  itemId    String
+  item      Item     @relation(fields: [itemId], references: [id], onDelete: Cascade)
+  kind      String   // "PHOTO" | "MANUAL" | "RECEIPT"
+  url       String
+  name      String?
+  createdAt DateTime @default(now())
+
+  @@index([itemId])
+}
+
+enum ItemLogType {
+  NOTE
+  MAINTENANCE
+  MOVED
+  PURCHASED
+  REPAIRED
+  DISPOSED
+}
+
+model ItemLog {
+  id        String      @id @default(cuid())
+  itemId    String
+  item      Item        @relation(fields: [itemId], references: [id], onDelete: Cascade)
+  type      ItemLogType
+  date      DateTime    @default(now())
+  notes     String?
+  cost      Decimal?    @db.Decimal(10, 2)
+  actorId   String?
+  createdAt DateTime    @default(now())
+
+  @@index([itemId])
+  @@index([date])
+}