feat: add garden module infrastructure (task 70)

- Add MinIO service to compose.yaml with named volume
- Add generic /api/uploads POST+GET route with auth, 5 MB, image/* guards
- Add src/lib/minio.ts singleton client with ensureBucket helper
- Add garden Drizzle schema: containers, plants, care_logs, care_schedules, species_cache
- Register garden module in src/modules/index.ts and src/lib/db.ts
- Apply migration 0015_garden_schema.sql
- Add MINIO_* and PERENUAL_API_KEY to .env.example
- Add task briefs 70-75 for the full garden feature arc
- Add uploads.spec.ts E2E test (RED → GREEN on route auth guard)

src/app/api/uploads/route.ts

@@ -0,0 +1,57 @@
+import { randomUUID } from "node:crypto";
+import { NextResponse } from "next/server";
+import { getCurrentSession } from "@/lib/session";
+import { ensureBucket, minioClient, MINIO_BUCKET } from "@/lib/minio";
+
+export const runtime = "nodejs";
+
+const MAX_FILE_SIZE = 5 * 1024 * 1024;
+
+export async function POST(request: Request) {
+  let session: Awaited<ReturnType<typeof getCurrentSession>>;
+  try {
+    session = await getCurrentSession();
+  } catch {
+    return NextResponse.json({ error: "Unauthorized" }, { status: 401 });
+  }
+
+  let formData: FormData;
+  try {
+    formData = await request.formData();
+  } catch {
+    return NextResponse.json({ error: "Invalid multipart body" }, { status: 400 });
+  }
+
+  const file = formData.get("file");
+  if (!(file instanceof File)) {
+    return NextResponse.json({ error: "No file field in request" }, { status: 400 });
+  }
+
+  if (!file.type.startsWith("image/")) {
+    return NextResponse.json({ error: "Only image files are allowed" }, { status: 415 });
+  }
+
+  if (file.size > MAX_FILE_SIZE) {
+    return NextResponse.json({ error: "File exceeds 5 MB limit" }, { status: 413 });
+  }
+
+  const rawExt = file.name.split(".").pop() ?? "bin";
+  const safeExt = rawExt
+    .replace(/[^a-z0-9]/gi, "")
+    .toLowerCase()
+    .slice(0, 8);
+  const key = `garden/${session.household.id}/${randomUUID()}.${safeExt}`;
+
+  try {
+    await ensureBucket();
+    const buffer = Buffer.from(await file.arrayBuffer());
+    await minioClient.putObject(MINIO_BUCKET, key, buffer, buffer.length, {
+      "Content-Type": file.type,
+    });
+  } catch (err) {
+    console.error("Upload failed", err);
+    return NextResponse.json({ error: "Upload service unavailable" }, { status: 503 });
+  }
+
+  return NextResponse.json({ url: `/api/uploads/${key}` });
+}