chore: Initialize workspace structure

- Add workspace Cargo.toml with members
- Add .gitignore for Rust projects

.gitignore

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+# Rust build artifacts
+/target/
+**/target/
+
+# Cargo lock (optional - can be committed for binaries)
+# Cargo.lock
+
+# IDE
+.idea/
+.vscode/
+*.swp
+*.swo
+*~
+
+# OS
+.DS_Store
+Thumbs.db
+
+# Backup files
+*.bak
+*.orig

Cargo.toml

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+[workspace]
+resolver = "2"
+members = [
+    "simul-core",
+    "simul-euclidean",
+    "simul",
+]
+
+[workspace.package]
+version = "0.1.0"
+edition = "2021"
+license = "MIT"
+repository = "https://github.com/example/simul"
+
+[workspace.dependencies]
+# Core dependencies
+nalgebra = "0.33"
+thiserror = "2"
+rand = "0.8"
+rand_distr = "0.4"
+
+# Parallelization
+rayon = "1.10"
+
+# Testing
+approx = "0.5"
+
+# Internal crates
+simul-core = { path = "simul-core" }
+simul-euclidean = { path = "simul-euclidean" }