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/Cargo.toml

@@ -0,0 +1,44 @@
+[package]
+authors = ["louisfd <louisfd94@gmail.com>"]
+categories = ["science"]
+description = "[Deprecated] Candle backend for the Burn framework - use burn-cubecl, burn-ndarray, or burn-tch instead"
+edition.workspace = true
+keywords = ["deep-learning", "machine-learning", "data"]
+license.workspace = true
+name = "burn-candle"
+readme.workspace = true
+repository = "https://github.com/tracel-ai/burn/tree/main/crates/burn-candle"
+documentation = "https://docs.rs/burn-candle"
+version.workspace = true
+
+[lints]
+workspace = true
+
+[features]
+default = ["std"]
+std = []
+doc = ["default"]
+tracing = [
+    "burn-backend/tracing",
+    "burn-std/tracing",
+]
+
+cuda = ["candle-core/cuda"]
+metal = ["candle-core/metal"]
+accelerate = ["candle-core/accelerate"]
+
+[dependencies]
+burn-backend = { path = "../burn-backend", version = "=0.21.0-pre.2", default-features = false }
+# For rand utils and stub mutex
+burn-std = { path = "../burn-std", version = "=0.21.0-pre.2", default-features = false }
+
+candle-core = { workspace = true }
+derive-new = { workspace = true }
+
+[dev-dependencies]
+burn-tch = { path = "../burn-tch", version = "=0.21.0-pre.2", default-features = false, features = [
+] }
+
+[package.metadata.docs.rs]
+features = ["doc"]
+rustdoc-args = ["--cfg", "docsrs"]