feat: update workspace paths and enhance gitignore

- Updated stablediffusion crate path from "../stable-diffusion-burn" to "./crates/stable-diffusion-burn" for proper workspace resolution
- Enhanced .gitignore to include generated model files (.mpk, .pt, .bin, .safetensors, .ckpt) and user_data directory
- Added Cargo.lock to gitignore with appropriate comment
- Reorganized IDE files section in gitignore for better clarity
- Added newline at end of file for proper formatting

crates/stable-diffusion-burn/burn-crates/burn-backend-tests/tests/autodiff/neg.rs

@@ -0,0 +1,26 @@
+use super::*;
+use burn_tensor::TensorData;
+
+#[test]
+fn should_diff_neg() {
+    let data_1 = TensorData::from([[1.0, 7.0], [2.0, 3.0]]);
+    let data_2 = TensorData::from([[4.0, 7.0], [2.0, 3.0]]);
+
+    let device = Default::default();
+    let tensor_1 = TestAutodiffTensor::<2>::from_data(data_1, &device).require_grad();
+    let tensor_2 = TestAutodiffTensor::from_data(data_2, &device).require_grad();
+
+    let tensor_3 = tensor_1.clone().matmul(tensor_2.clone().neg());
+    let tensor_4 = tensor_3.neg();
+    let grads = tensor_4.backward();
+
+    let grad_1 = tensor_1.grad(&grads).unwrap();
+    let grad_2 = tensor_2.grad(&grads).unwrap();
+
+    grad_1
+        .to_data()
+        .assert_eq(&TensorData::from([[11.0, 5.0], [11.0, 5.0]]), false);
+    grad_2
+        .to_data()
+        .assert_eq(&TensorData::from([[3.0, 3.0], [10.0, 10.0]]), false);
+}