Initial project setup: Rust/WASM solar system simulator with SvelteKit frontend

- Rust workspace with 4 crates: orbital-mechanics, mass-driver-core, mass-driver-wasm, mass-driver-backend
- Keplerian orbital mechanics engine with JPL elements for 14 bodies (Sun, 8 planets, Pluto, Ceres, Europa, Titan, Ganymede)
- Kepler equation solver and orbital position computation compiled to WASM
- SvelteKit frontend with Tailwind CSS, Canvas2D renderer showing animated solar system
- Orbit ellipses, planet dots with labels, Sun glow, grid, scale bar, pan/zoom controls
- Time controls (play/pause, 5 speed levels, date picker) driving live simulation
- 2D/3D view toggle (3D placeholder for Threlte integration)

Co-Authored-By: Claude Opus 4.6 (1M context) <noreply@anthropic.com>

Cargo.toml

@@ -0,0 +1,13 @@
+[workspace]
+resolver = "2"
+members = [
+    "crates/orbital-mechanics",
+    "crates/mass-driver-core",
+    "crates/mass-driver-wasm",
+    "crates/mass-driver-backend",
+]
+
+[workspace.dependencies]
+nalgebra = "0.33"
+serde = { version = "1", features = ["derive"] }
+serde_json = "1"