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/lists/schema.ts

@@ -1,4 +1,13 @@
-import { index, integer, pgTable, text, timestamp, uuid, boolean } from "drizzle-orm/pg-core";
+import {
+  index,
+  integer,
+  jsonb,
+  pgTable,
+  text,
+  timestamp,
+  uuid,
+  boolean,
+} from "drizzle-orm/pg-core";
 import { households, users } from "../_core/schema";
 
 export const lists = pgTable(
@@ -33,6 +42,7 @@ export const listItems = pgTable(
     dueAt: timestamp("due_at", { withTimezone: true }),
     assigneeId: uuid("assignee_id").references(() => users.id, { onDelete: "set null" }),
     position: integer("position").notNull().default(0),
+    metadata: jsonb("metadata").$type<Record<string, unknown>>(),
     createdAt: timestamp("created_at", { withTimezone: true }).notNull().defaultNow(),
     updatedAt: timestamp("updated_at", { withTimezone: true }).notNull().defaultNow(),
   },