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-wgpu/README.md

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+# Burn WGPU Backend
+
+[Burn](https://github.com/tracel-ai/burn) WGPU backend
+
+[![Current Crates.io Version](https://img.shields.io/crates/v/burn-wgpu.svg)](https://crates.io/crates/burn-wgpu)
+[![license](https://shields.io/badge/license-MIT%2FApache--2.0-blue)](https://github.com/tracel-ai/burn-wgpu/blob/master/README.md)
+
+This crate provides a WGPU backend for [Burn](https://github.com/tracel-ai/burn) using the
+[wgpu](https://github.com/gfx-rs/wgpu).
+
+The backend supports Vulkan, Metal, DirectX11/12, OpenGL, WebGPU.
+
+## Usage Example
+
+```rust
+#[cfg(feature = "wgpu")]
+mod wgpu {
+    use burn_autodiff::Autodiff;
+    use burn_wgpu::{Wgpu, WgpuDevice};
+    use mnist::training;
+
+    pub fn run() {
+        let device = WgpuDevice::default();
+        training::run::<Autodiff<Wgpu<f32, i32>>>(device);
+    }
+}
+```
+
+> ⚠️ **Warning**  
+> When using one of the `wgpu` backends, you may encounter compilation errors related to recursive type evaluation. This is due to complex type nesting within the `wgpu` dependency chain.  
+> To resolve this issue, add the following line at the top of your `main.rs` or `lib.rs` file:
+> ```rust
+> #![recursion_limit = "256"]
+> ```
+> The default recursion limit (128) is often just below the required depth (typically 130-150) due to deeply nested associated types and trait bounds.
+
+
+## Configuration
+
+You can set `BURN_WGPU_MAX_TASKS` to a positive integer that determines how many computing tasks are
+submitted in batches to the graphics API.
+
+## Alternative SPIR-V backend
+
+When targeting Vulkan, the `spirv` feature flag can be enabled to enable the SPIR-V compiler
+backend, which performs significantly better than WGSL. This is especially true for matrix
+multiplication, where SPIR-V can make use of TensorCores and run at `f16` precision. This isn't
+currently supported by WGSL. The compiler can also be selected at runtime by setting the
+corresponding generic parameter to either `SpirV` or `Wgsl`.
+
+## Platform Support
+
+| Option    | CPU | GPU | Linux | MacOS | Windows | Android | iOS | WASM |
+| :-------- | :-: | :-: | :---: | :---: | :-----: | :-----: | :-: | :--: |
+| Metal     | No  | Yes |  No   |  Yes  |   No    |   No    | Yes |  No  |
+| Vulkan    | Yes | Yes |  Yes  |  Yes  |   Yes   |   Yes   | Yes |  No  |
+| OpenGL    | No  | Yes |  Yes  |  Yes  |   Yes   |   Yes   | Yes |  No  |
+| WebGpu    | No  | Yes |  No   |  No   |   No    |   No    | No  | Yes  |
+| Dx11/Dx12 | No  | Yes |  No   |  No   |   Yes   |   No    | No  |  No  |