feat: add idfoto-wasm crate with wasm-bindgen wrappers and TOTP

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

crates/idfoto-wasm/Cargo.toml

@@ -0,0 +1,20 @@
+[package]
+name = "idfoto-wasm"
+version = "0.1.0"
+edition = "2021"
+description = "WASM bindings for idfoto password manager"
+
+[lib]
+crate-type = ["cdylib", "rlib"]
+
+[dependencies]
+idfoto-core = { path = "../idfoto-core" }
+wasm-bindgen = "0.2"
+js-sys = "0.3"
+serde_json = "1"
+hmac = "0.12"
+sha1 = "0.10"
+data-encoding = "2"
+
+[dev-dependencies]
+wasm-bindgen-test = "0.3"