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/Cargo.toml

@@ -0,0 +1,28 @@
+[package]
+name = "stablediffusion"
+version = "0.1.0"
+edition = "2021"
+
+# See more keys and their definitions at https://doc.rust-lang.org/cargo/reference/manifest.html
+
+[features]
+wgpu-backend = ["burn-wgpu"]
+
+[dependencies.burn-wgpu]
+package = "burn-wgpu"
+git = "https://github.com/burn-rs/burn.git"
+optional = true
+
+[dependencies]
+burn = "0.14.0"
+burn-ndarray = "0.14.0"
+burn-tch = "0.14.0"
+burn-autodiff = "0.14.0"
+tch = "0.15.0"
+serde = {version = "1.0.171", features = ["std", "derive"]}
+npy = "0.4.0"
+num-traits = "0.2.15"
+rust_tokenizers = "8.1.0"
+regex = "1.9.1"
+image = "0.24.6"
+cfg-if = "0.1"