v0.10.0 — Location spine: garden moved onto a shared place tree

Completes the Location feature (schema + migration landed earlier under 98cabc5).

- Hierarchical Location model is the shared spine; unlimited nesting
- Garden add/edit now picks a reusable Location (inline create) instead of
  freeform text; garden groups By Location off the real tree
- Dual-write keeps legacy Plant.zone in sync with location.name (Release A)
- /api/locations CRUD + /api/locations/[id]/log (logs a location + its sub-locations)
- Location tree pure-core (buildTree/computePath/descendantIds) with tests
- Location added to backup/restore export
- Bump APP_VERSION 0.10.0 + plain-English changelog entry

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

prisma/seed.ts

@@ -56,6 +56,25 @@ async function main() {
     { commonName: "Garlic", variety: "Music", category: PlantCategory.BULB, zone: "Raised bed #1", source: "Keene Organics", plantedAt: new Date("2024-10-10") },
   ];
 
+  // Starter Location tree — a root property node with the garden areas under it.
+  const root = await db.location.upsert({
+    where: { id: "seed-loc-root" },
+    update: {},
+    create: { id: "seed-loc-root", name: "Moon Homestead", kind: "OTHER", path: "Moon Homestead" },
+  });
+
+  const zoneNames = Array.from(new Set(plants.map((p) => p.zone).filter(Boolean) as string[]));
+  const zoneToLocId = new Map<string, string>();
+  for (const z of zoneNames) {
+    const id = `seed-loc-${z.toLowerCase().replace(/[^a-z0-9]+/g, "-")}`;
+    await db.location.upsert({
+      where: { id },
+      update: {},
+      create: { id, name: z, kind: "AREA", parentId: root.id, path: `Moon Homestead › ${z}` },
+    });
+    zoneToLocId.set(z, id);
+  }
+
   for (const p of plants) {
     await db.plant.upsert({
       where: { id: `seed-${p.commonName.toLowerCase().replace(/\s/g, "-")}-${p.variety?.toLowerCase().replace(/\s/g, "-") ?? "0"}` },
@@ -63,6 +82,7 @@ async function main() {
       create: {
         id: `seed-${p.commonName.toLowerCase().replace(/\s/g, "-")}-${p.variety?.toLowerCase().replace(/\s/g, "-") ?? "0"}`,
         ...p,
+        locationId: p.zone ? zoneToLocId.get(p.zone) : undefined,
       },
     });
   }