Add /api/health endpoint to diagnose MinIO connectivity

Tests S3 bucket access and falls back to a raw HTTP fetch to show
what the endpoint actually returns (helps identify port misconfiguration).

Made-with: Cursor

src/app/api/health/route.ts

@@ -0,0 +1,45 @@
+import { NextResponse } from "next/server";
+import { HeadBucketCommand } from "@aws-sdk/client-s3";
+import { s3, BUCKET } from "@/lib/minio";
+
+export async function GET() {
+  const results: Record<string, unknown> = {
+    minio: { status: "unknown" },
+    minioConfig: {
+      endpoint: process.env.MINIO_ENDPOINT || "192.168.68.105",
+      port: process.env.MINIO_PORT || "9000",
+      bucket: BUCKET,
+    },
+  };
+
+  try {
+    await s3.send(new HeadBucketCommand({ Bucket: BUCKET }));
+    results.minio = { status: "ok", bucket: BUCKET };
+  } catch (error: unknown) {
+    const err = error as Error & { $response?: { body?: unknown }; $metadata?: unknown; Code?: string };
+    results.minio = {
+      status: "error",
+      message: err.message,
+      code: err.Code,
+      metadata: err.$metadata,
+    };
+
+    // Try a raw fetch to see what the endpoint actually returns
+    try {
+      const endpoint = `http://${process.env.MINIO_ENDPOINT || "192.168.68.105"}:${process.env.MINIO_PORT || "9000"}`;
+      const rawRes = await fetch(endpoint, { signal: AbortSignal.timeout(5000) });
+      const rawBody = await rawRes.text();
+      results.rawEndpointResponse = {
+        status: rawRes.status,
+        contentType: rawRes.headers.get("content-type"),
+        bodyPreview: rawBody.slice(0, 500),
+      };
+    } catch (fetchErr: unknown) {
+      results.rawEndpointResponse = {
+        error: (fetchErr as Error).message,
+      };
+    }
+  }
+
+  return NextResponse.json(results, { status: 200 });
+}