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/[...key]/route.ts

@@ -0,0 +1,34 @@
+import { NextResponse } from "next/server";
+import { minioClient, MINIO_BUCKET } from "@/lib/minio";
+
+export const runtime = "nodejs";
+
+export async function GET(_request: Request, { params }: { params: Promise<{ key: string[] }> }) {
+  const { key } = await params;
+  const objectKey = key.join("/");
+
+  try {
+    const stat = await minioClient.statObject(MINIO_BUCKET, objectKey);
+    const stream = await minioClient.getObject(MINIO_BUCKET, objectKey);
+
+    const chunks: Buffer[] = [];
+    for await (const chunk of stream) {
+      chunks.push(Buffer.isBuffer(chunk) ? chunk : Buffer.from(chunk as Uint8Array));
+    }
+    const buffer = Buffer.concat(chunks);
+
+    const metaData = stat.metaData as Record<string, string> | undefined;
+    const contentType =
+      metaData?.["content-type"] ?? metaData?.["Content-Type"] ?? "application/octet-stream";
+
+    return new Response(buffer, {
+      headers: {
+        "Content-Type": contentType,
+        "Cache-Control": "public, max-age=31536000, immutable",
+        "Content-Length": String(buffer.length),
+      },
+    });
+  } catch {
+    return NextResponse.json({ error: "Not found" }, { status: 404 });
+  }
+}