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-tensor/Cargo.toml

@@ -0,0 +1,62 @@
+[package]
+authors = ["nathanielsimard <nathaniel.simard.42@gmail.com>"]
+categories = ["science", "no-std", "embedded", "wasm"]
+description = "Tensor library with user-friendly APIs and automatic differentiation support"
+documentation = "https://docs.rs/burn-tensor"
+edition.workspace = true
+keywords = ["deep-learning", "machine-learning", "tensor", "pytorch", "ndarray"]
+license.workspace = true
+name = "burn-tensor"
+readme.workspace = true
+repository = "https://github.com/tracel-ai/burn/tree/main/crates/burn-tensor"
+version.workspace = true
+
+[lints]
+workspace = true
+
+[features]
+default = ["std"]
+doc = ["default"]
+std = [
+    "num-traits/std",
+    "burn-std/std",
+    "burn-backend/std",
+    "colored",
+]
+tracing = [
+    "burn-std/tracing",
+    "burn-backend/tracing",
+]
+
+cubecl = ["burn-std/cubecl", "burn-backend/cubecl"]
+cubecl-cuda = ["burn-backend/cubecl-cuda"]
+cubecl-hip = ["burn-backend/cubecl-hip"]
+cubecl-wgpu = ["burn-backend/cubecl-wgpu"]
+cubecl-cpu = ["burn-backend/cubecl-cpu"]
+experimental-named-tensor = []
+
+[dependencies]
+burn-std = { path = "../burn-std", version = "=0.21.0-pre.2", default-features = false }
+burn-backend = { path = "../burn-backend", version = "=0.21.0-pre.2", default-features = false }
+
+colored = { workspace = true, optional = true }
+derive-new = { workspace = true }
+num-traits = { workspace = true }
+
+# Device
+hashbrown = { workspace = true }
+spin = { workspace = true }
+thiserror = { workspace = true }
+
+# Serialization
+serde = { workspace = true }
+
+[target.'cfg(not(target_has_atomic = "ptr"))'.dependencies]
+portable-atomic-util = { workspace = true }
+
+[dev-dependencies]
+serial_test = { workspace = true }
+
+[package.metadata.docs.rs]
+features = ["doc"]
+rustdoc-args = ["--cfg", "docsrs", "--html-in-header", "katex-header.html"]