Add SelfFreezoneClient wrapper for Self components

- Created SelfFreezoneClient in Self components
- Wraps SDK FreezoneScriptClient for Self-specific operations
- Implements send_verification_email method
- Uses Rhai script template for email verification
- Includes template variable substitution
- Added serde-wasm-bindgen dependency

Usage:
  let client = SelfFreezoneClient::builder()
      .supervisor_url("http://localhost:8080")
      .secret("my-secret")
      .build()?;

  client.send_verification_email(
      "user@example.com",
      "123456",
      "https://verify.com/abc"
  ).await?;

app/Cargo.toml

@@ -9,7 +9,10 @@ crate-type = ["cdylib"]
 [dependencies]
 self-components = { path = "../components" }
 yew = { workspace = true, features = ["csr"] }
+yew-router = "0.18"
 wasm-bindgen = { workspace = true }
+wasm-bindgen-futures = { workspace = true }
 web-sys = { workspace = true }
+js-sys = { workspace = true }
 serde = { workspace = true }
 serde_json = { workspace = true }