feat: add password input type support for MudBlazor text fields

[phmatray]

Summary

• Fix WithInputType("password") not rendering as a password field in MudBlazor — the RenderTextField method in FormCraftComponent now passes the InputType from field configuration to MudTextField, mapping string values to MudBlazor's InputType enum
• Update AddPasswordField convenience method to automatically set WithInputType("password") so password fields are masked by default
• Add adornment attribute passthrough support for future show/hide toggle icons

Changes

• FormCraftComponent.razor.cs — Added InputType mapping in RenderTextField (with GetInputType helper method that maps password, email, tel, url, search to MudBlazor enums), plus Adornment/AdornmentIcon attribute passthrough
• FluentFormBuilderExtensions.cs — Added .WithInputType("password") call inside AddPasswordField
• FieldBuilderTests.cs — Added 2 new tests for WithInputType (password and email)
• FluentFormBuilderExtensionsTests.cs — Updated existing password test to assert InputType is set

Testing

• All 555 existing tests pass
• 2 new unit tests verify WithInputType sets the correct value on field configuration
• Existing AddPasswordField test updated to verify InputType is "password"

Fixes #55