feat: garden plants crud (task 72)

- perenual species lookup with 24h db cache (api key optional)
- /api/garden/species-search route handler
- createPlant / updatePlant / deletePlant server actions
- addPlantImage / removePlantImage / setPrimaryImage actions (max 10)
- listPlants query grouped by container with last-watered subquery
- getPlant query with care log summary and active schedules
- plant-form client component with species autofill and image upload
- plant-list server component grouped by container with unassigned bucket
- plant-detail client component with info/gallery/care tabs
- species-search debounced combobox component
- /garden/plants/new, /[id], /[id]/edit pages
- garden.plant entity registered with search and share support
- /garden page updated to containers/plants tabs (default: containers)

src/app/api/garden/species-search/route.ts

@@ -0,0 +1,17 @@
+import { NextResponse } from "next/server";
+import { getCurrentSession } from "@/lib/session";
+import { searchSpecies } from "@/modules/garden/server/species-lookup";
+
+export async function GET(request: Request) {
+  try {
+    await getCurrentSession();
+  } catch {
+    return NextResponse.json({ error: "Unauthorized" }, { status: 401 });
+  }
+
+  const { searchParams } = new URL(request.url);
+  const q = searchParams.get("q") ?? "";
+
+  const results = await searchSpecies(q);
+  return NextResponse.json(results);
+}