Setup Rust workspace and remove git submodules

- Add workspace Cargo.toml with shared dependencies
- Remove .gitmodules file
- Remove components/ directory (will be replaced with subtrees)
- Prepare for workspace-based component management

Cargo.toml

@@ -0,0 +1,55 @@
+[workspace]
+resolver = "2"
+members = [
+    "components/zinit",
+    "components/mycelium",
+    "components/rfs",
+]
+
+[workspace.dependencies]
+# Common dependencies used across Zero-OS components
+tokio = { version = "1.0", features = ["full"] }
+serde = { version = "1.0", features = ["derive"] }
+serde_json = "1.0"
+clap = { version = "4.0", features = ["derive"] }
+anyhow = "1.0"
+thiserror = "1.0"
+log = "0.4"
+env_logger = "0.10"
+futures = "0.3"
+async-trait = "0.1"
+
+# Networking
+reqwest = { version = "0.11", features = ["json"] }
+hyper = { version = "0.14", features = ["full"] }
+tonic = { version = "0.10", features = ["default"] }
+
+# Crypto and encoding
+base64 = "0.21"
+hex = "0.4"
+sha2 = "0.10"
+rand = "0.8"
+
+# System and filesystem
+nix = "0.27"
+libc = "0.2"
+tempfile = "3.0"
+
+# Async runtime and utilities
+parking_lot = "0.12"
+dashmap = "5.0"
+uuid = { version = "1.0", features = ["v4"] }
+
+[profile.release]
+# Optimize for size and performance
+opt-level = "z"        # Optimize for size
+lto = true             # Link-time optimization
+codegen-units = 1      # Better optimization
+panic = "abort"        # Smaller binaries
+strip = true           # Remove symbols
+
+[profile.dev]
+# Faster debug builds
+opt-level = 1          # Some optimization for faster debug builds
+debug = true           # Debug info
+split-debuginfo = "unpacked"  # Faster linking on macOS/Windows