doc(MFA): add MFA sample code

[ArgoZhang]

Link issues

fixes #5974

Summary By Copilot

Regression?

• Yes
• No

Risk

• High
• Medium
• Low

Verification

• Manual (required)
• Automated

Packaging changes reviewed?

• Yes
• No
• N/A

☑️ Self Check before Merge

⚠️ Please check all items below before review. ⚠️

• Doc is updated/provided or not needed
• Demo is updated/provided or not needed
• Merge the latest code from the main branch

Summary by Sourcery

Add Multi-Factor Authentication (MFA) sample code and tutorial pages to the BootstrapBlazor project

New Features:

• Implemented MFA tutorial pages with login, two-factor authentication, and authenticator app flows

Enhancements:

• Updated MainLayout to use dynamic asset URL retrieval

Documentation:

• Added new navigation menu item for MFA tutorials

[sourcery-ai]

Reviewer's Guide

This pull request introduces a Multi-Factor Authentication (MFA) sample by adding new Razor components (Login.razor, TwoFactor.razor, TwoFactorApp.razor) that demonstrate an MFA process, styled using accompanying CSS files. The implementation includes adding a navigation link to this MFA tutorial within TutorialsNavMenu.razor.cs, with necessary localization. A minor refactoring in MainLayout.razor updates an image's source URL to use a helper method.

Sequence Diagram for Two-Factor App Verification

sequenceDiagram
    actor User
    participant TwoFactorApp
    participant TotpService
    participant ToastService

    User->>TwoFactorApp: Enters OTP code
    User->>TwoFactorApp: Clicks "Sign in" button
    TwoFactorApp->>TotpService: Verify(code)
    alt Verification Success
        TotpService-->>TwoFactorApp: true
        TwoFactorApp->>ToastService: Success("Sign In", "Login success...")
        ToastService-->>User: Show Success Toast
    else Verification Failure
        TotpService-->>TwoFactorApp: false
        TwoFactorApp->>ToastService: Error("Sign In", "Login failed.")
        ToastService-->>User: Show Error Toast
    end

Loading

Class Diagram for New MFA Components

classDiagram
    direction LR
    class Login {
      +NavigationManager NavigationManager
      +OnSubmit()
    }
    note for Login "Navigates to /tutorials/mfa/two-factor"

    class TwoFactor {
      +IOptionsMonitor<WebsiteOptions> WebsiteOption
    }
    note for TwoFactor "Displays MFA options, links to /tutorials/mfa/two-factor/app"

    class TwoFactorApp {
      +ITotpService TotpService
      +ToastService ToastService
      -string _code
      +OnVerify()
    }
    note for TwoFactorApp "Verifies OTP code using TotpService"

    Login ..> NavigationManager : Uses
    TwoFactor ..> IOptionsMonitor : Uses
    TwoFactorApp ..> ITotpService : Uses
    TwoFactorApp ..> ToastService : Uses

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File-Level Changes

Change	Details	Files
Implemented MFA sample pages and navigation.	Created Razor components for MFA login, 2FA prompt, and 2FA app verification. Added dedicated CSS styles for the new MFA sample pages. Added a navigation link to the MFA tutorial in the side menu. Included localization for the 'MFA' tutorial item.	src/BootstrapBlazor.Server/Components/Layout/TutorialsNavMenu.razor.cs src/BootstrapBlazor.Server/Components/Samples/Tutorials/MFA/Login.razor src/BootstrapBlazor.Server/Components/Samples/Tutorials/MFA/Login.razor.css src/BootstrapBlazor.Server/Components/Samples/Tutorials/MFA/TwoFactor.razor src/BootstrapBlazor.Server/Components/Samples/Tutorials/MFA/TwoFactor.razor.css src/BootstrapBlazor.Server/Components/Samples/Tutorials/MFA/TwoFactorApp.razor src/BootstrapBlazor.Server/Components/Samples/Tutorials/MFA/TwoFactorApp.razor.css src/BootstrapBlazor.Server/Locales/en-US.json src/BootstrapBlazor.Server/Locales/zh-CN.json
Refactored image asset URL in main layout.	Updated the logo image source to use the GetAssetUrl helper method.	src/BootstrapBlazor.Server/Components/Layout/MainLayout.razor

Assessment against linked issues

Issue	Objective	Addressed	Explanation
#5974	Add sample code for MFA component.	✅

Possibly linked issues

• doc(MFA): add MFA sample code #5974: The PR adds MFA sample code and related UI components as requested in the issue.

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[sourcery-ai]

Hey @ArgoZhang - I've reviewed your changes - here's some feedback:

• The sample login page uses hardcoded credentials; consider clarifying in the code or UI that these are for demonstration purposes.
• Consider consolidating common CSS styles, such as .bb-sign-body and .bb-sign-callout, across the new MFA pages to improve maintainability.

Here's what I looked at during the review

• 🟡 General issues: 1 issue found
• 🟡 Security: 1 issue found
• 🟢 Testing: all looks good
• 🟢 Complexity: all looks good
• 🟢 Documentation: all looks good

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[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 100.00%. Comparing base (496004b) to head (cca0cce).
Report is 1 commits behind head on main.

Additional details and impacted files

@@            Coverage Diff            @@
##              main     #5975   +/-   ##
=========================================
  Coverage   100.00%   100.00%           
=========================================
  Files          670       670           
  Lines        30606     30606           
  Branches      4352      4352           
=========================================
  Hits         30606     30606           

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