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-ndarray/build.rs

@@ -0,0 +1,6 @@
+fn main() {
+    // https://github.com/rust-ndarray/ndarray/issues/1197
+    if cfg!(feature = "blas-accelerate") {
+        println!("cargo:rustc-link-lib=framework=Accelerate");
+    }
+}