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-candle/src/lib.rs

@@ -0,0 +1,27 @@
+#![warn(missing_docs)]
+#![cfg_attr(docsrs, feature(doc_cfg))]
+#![allow(unused)] // TODO remove when backend filled
+#![deprecated(
+    since = "0.21.0-pre.2",
+    note = "burn-candle is deprecated and will be removed in a future release. Use burn-cubecl (CUDA/ROCm/Vulkan/Metal/WebGPU), burn-ndarray, or burn-tch instead."
+)]
+
+//! Burn Candle Backend
+//!
+//! **Deprecated:** This backend is deprecated and will be removed in a future release.
+//! Please migrate to one of the actively maintained backends:
+//! - CubeCL backends (CUDA, ROCm, Vulkan, Metal, WebGPU) for GPU acceleration
+//! - NdArray for portable CPU execution
+//! - LibTorch (`burn-tch`) for a mature CPU/GPU backend
+
+#[macro_use]
+extern crate derive_new;
+
+mod backend;
+mod element;
+mod ops;
+mod tensor;
+
+pub use backend::*;
+pub use element::*;
+pub use tensor::*;