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/test/mocks/onnxruntime-node.ts

@@ -0,0 +1,9 @@
+/**
+ * Mock for onnxruntime-node.
+ * Used during testing when the real package isn't installed.
+ * The model-loader will fall back to mock mode when this import fails.
+ */
+
+// This mock throws on load to simulate the package not being available
+// The model-loader catches this and falls back to mock mode
+throw new Error("onnxruntime-node not installed");