feat: garden care reminder bodies, task sync, upload cleanup

- care reminders now fire with plant-specific body ("Time to water Pothos")
  via title/body columns on the reminders table (migration 0016)
- bi-directional task sync: checking off a garden-linked task list item
  creates a care log; logging care from garden marks the linked task done
  (list_items.metadata stores gardenPlantId + gardenCareType linkage)
- upload error response no longer leaks debug detail; error message
  corrected from "5 MB" to "100 MB"

src/modules/garden/server/care-utils.ts

@@ -0,0 +1,16 @@
+const CARE_VERBS: Record<string, string> = {
+  watering: "Water",
+  fertilizing: "Fertilize",
+  repotting: "Repot",
+  pruning: "Prune",
+};
+
+export function buildCareTitle(careType: string, plantName: string): string {
+  const verb = CARE_VERBS[careType];
+  return verb ? `${verb} ${plantName}` : `${careType} — ${plantName}`;
+}
+
+export function buildCareReminderBody(careType: string, plantName: string): string {
+  const verb = CARE_VERBS[careType]?.toLowerCase() ?? careType;
+  return `Time to ${verb} ${plantName}`;
+}