security(deps): remove vulnerable xmas-elf dependency via embuild (#414)

* security(deps): remove vulnerable xmas-elf dependency via embuild

* chore(deps): update dependencies and improve ESP-IDF compatibility

- Updated `bindgen`, `embassy-sync`, `embedded-svc`, and `embuild` versions in `Cargo.lock`.
- Added patch section in `Cargo.toml` to use latest esp-rs crates for better compatibility with ESP-IDF 5.x.
- Enhanced README with updated prerequisites and build instructions for Python and Rust tools.
- Introduced `rust-toolchain.toml` to pin nightly Rust and added necessary components.
- Modified GPIO handling in `main.rs` to improve pin management and added support for 64-bit time_t in ESP-IDF.
- Updated `.cargo/config.toml` for new linker and runner configurations.

* docs: add detailed setup guide for ESP32 firmware and link in README

- Introduced a new `SETUP.md` file with comprehensive step-by-step instructions for building and flashing the ZeroClaw ESP32 firmware.
- Updated `README.md` to include a link to the new setup guide for easier access to installation and troubleshooting information.

* chore: update .gitignore and refactor main.rs for improved readability

- Added .embuild/ to .gitignore to exclude ESP32 build cache.
- Refactored code in main.rs for better readability by adjusting the formatting of the handle_request function call.

* docs: add newline for better readability in README.md

- Added a newline in the protocol section of README.md to enhance clarity and formatting.

* chore: configure workspace settings in Cargo.toml

- Added workspace configuration to `Cargo.toml` with members and resolver settings for improved project management.

---------

Co-authored-by: ehushubhamshaw <eshaw1@wpi.edu>
Co-authored-by: Will Sarg <12886992+willsarg@users.noreply.github.com>

firmware/zeroclaw-esp32/Cargo.toml

@@ -14,15 +14,21 @@ edition = "2021"
 license = "MIT"
 description = "ZeroClaw ESP32 peripheral firmware — GPIO over JSON serial"
 
+[patch.crates-io]
+# Use latest esp-rs crates to fix u8/i8 char pointer compatibility with ESP-IDF 5.x
+esp-idf-sys = { git = "https://github.com/esp-rs/esp-idf-sys" }
+esp-idf-hal = { git = "https://github.com/esp-rs/esp-idf-hal" }
+esp-idf-svc = { git = "https://github.com/esp-rs/esp-idf-svc" }
+
 [dependencies]
-esp-idf-svc = "0.48"
+esp-idf-svc = { git = "https://github.com/esp-rs/esp-idf-svc" }
 log = "0.4"
 anyhow = "1.0"
 serde = { version = "1.0", features = ["derive"] }
 serde_json = "1.0"
 
 [build-dependencies]
-embuild = "0.31"
+embuild = { version = "0.33", features = ["espidf"] }
 
 [profile.release]
 opt-level = "s"