fix(garden): accept relative urls for plant image uploads

Zod v4 changed .url() to use the WHATWG URL spec, which rejects relative
paths like /api/uploads/... that our upload API returns. Relax image URL
validators to z.string().min(1) since these are internal paths.

src/modules/garden/server/actions.ts

@@ -118,8 +118,8 @@ const plantInput = z.object({
   fertilizingNotes: z.string().trim().max(2000).nullable().optional(),
   notes: z.string().trim().max(2000).nullable().optional(),
   acquisitionDate: z.string().nullable().optional(),
-  images: z.array(z.string().url()).max(10).default([]),
-  primaryImageUrl: z.string().url().nullable().optional(),
+  images: z.array(z.string().min(1)).max(10).default([]),
+  primaryImageUrl: z.string().min(1).nullable().optional(),
 });
 
 export async function createPlant(input: z.input<typeof plantInput>) {
@@ -230,7 +230,7 @@ export async function deletePlant(input: { id: string }) {
 }
 
 export async function addPlantImage(input: { id: string; url: string }) {
-  const parsed = z.object({ id: z.string().uuid(), url: z.string().url() }).parse(input);
+  const parsed = z.object({ id: z.string().uuid(), url: z.string().min(1) }).parse(input);
   const { household } = await getCurrentSession();
   await assertCanAccessPlant(parsed.id, household.id);