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/remainder.rs

@@ -0,0 +1,41 @@
+use super::*;
+use burn_tensor::TensorData;
+use burn_tensor::Tolerance;
+
+#[test]
+fn should_diff_remainder() {
+    let device = Default::default();
+    let tensor_1 = TestAutodiffTensor::<1>::from_data(
+        TensorData::from([
+            0.9742, 0.3676, 0.0905, 0.8066, 0.7072, 0.7883, 0.6987, 0.1560, 0.7179, 0.7874, 0.9032,
+            0.1845,
+        ]),
+        &device,
+    )
+    .require_grad();
+    let tensor_2 = TestAutodiffTensor::<1>::from_data(
+        TensorData::from([
+            0.3357, 0.0285, 0.4115, 0.5511, 0.8637, 0.3593, 0.3885, 0.2569, 0.0936, 0.7172, 0.4792,
+            0.4898,
+        ]),
+        &device,
+    )
+    .require_grad();
+    let tensor_3 = tensor_1.clone().remainder(tensor_2.clone());
+    let grads = tensor_3.backward();
+
+    let grad_1 = tensor_1.grad(&grads).unwrap();
+    let grad_2 = tensor_2.grad(&grads).unwrap();
+
+    let expected = TensorData::from([1.0, 1.0, 1.0, 1.0, 1.0, 1.0, 1.0, 1.0, 1.0, 1.0, 1.0, 1.0]);
+    grad_1
+        .to_data()
+        .assert_approx_eq::<FloatElem>(&expected, Tolerance::default());
+
+    let expected = TensorData::from([
+        -2.0, -12.0, -0.0, -1.0, -0.0, -2.0, -1.0, -0.0, -7.0, -1.0, -1.0, -0.0,
+    ]);
+    grad_2
+        .to_data()
+        .assert_approx_eq::<FloatElem>(&expected, Tolerance::default());
+}