feat: implement mass balance validation for Story 7.1

- Added port_mass_flows to Component trait and implements for core components.
- Added System::check_mass_balance and integrated it into the solver.
- Restored connect methods for ExpansionValve, Compressor, and Pipe to fix integration tests.
- Updated Python and C bindings for validation errors.
- Updated sprint status and story documentation.

bindings/wasm/Cargo.toml

@@ -0,0 +1,28 @@
+[package]
+name = "entropyk-wasm"
+description = "WebAssembly bindings for the Entropyk thermodynamic simulation library"
+version.workspace = true
+authors.workspace = true
+edition.workspace = true
+license.workspace = true
+repository.workspace = true
+
+[lib]
+name = "entropyk_wasm"
+crate-type = ["cdylib"]
+
+[dependencies]
+entropyk = { path = "../../crates/entropyk" }
+entropyk-core = { path = "../../crates/core" }
+entropyk-components = { path = "../../crates/components" }
+entropyk-solver = { path = "../../crates/solver" }
+entropyk-fluids = { path = "../../crates/fluids" }
+wasm-bindgen = "0.2"
+js-sys = "0.3"
+console_error_panic_hook = "0.1"
+serde = { version = "1.0", features = ["derive"] }
+serde_json = "1.0"
+serde-wasm-bindgen = "0.6"
+
+[dev-dependencies]
+wasm-bindgen-test = "0.3"