Initial commit: Plant Disease Identification app

- Next.js 16 App Router project with Tailwind CSS
- Plant disease knowledge base (93 diseases, 25 plants)
- Image upload with client+server preprocessing
- ML inference pipeline with mock/demo fallback
- Responsive results page with disease cards and treatment
- Full test suite (285 passing tests)

apps/web/src/lib/server/image-processing-server.ts

@@ -0,0 +1,51 @@
+/**
+ * Server-only image processing helpers.
+ *
+ * These functions use Node.js native modules (sharp) and must NOT be
+ * imported by client components. They are used exclusively by API
+ * route handlers (server-side).
+ */
+
+// ─── Resize ──────────────────────────────────────────────────────────────────
+
+/**
+ * Server-side image resize using sharp (if available) or a fallback.
+ * This is used by the upload API route.
+ *
+ * @param buffer - Raw image buffer
+ * @param size - Target dimension
+ * @returns Promise<Buffer> resized image as JPEG
+ */
+export async function resizeImageServer(
+  buffer: Buffer,
+  size: number,
+): Promise<Buffer> {
+  try {
+    const sharpModule = await import("sharp");
+    return sharpModule.default(buffer)
+      .resize(size, size)
+      .jpeg({ quality: 95 })
+      .toBuffer();
+  } catch {
+    // Fallback: return original buffer if sharp is not available
+    // In production, sharp should be installed
+    throw new Error(
+      "sharp is required for server-side image resizing. Install with: npm install sharp",
+    );
+  }
+}
+
+// ─── MIME Type Helpers ───────────────────────────────────────────────────────
+
+/**
+ * Generate a file extension from a MIME type.
+ */
+export function mimeTypeToExtension(mimeType: string): string {
+  const map: Record<string, string> = {
+    "image/png": "png",
+    "image/jpeg": "jpg",
+    "image/jpg": "jpg",
+    "image/webp": "webp",
+  };
+  return map[mimeType] || "jpg";
+}