doc(SelectRegion): add inject service method doc

[ArgoZhang]

Link issues

fixes #7339

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

Documentation:

• Add documentation snippet on registering the BootstrapBlazor region service in the SelectRegions sample.

[sourcery-ai]

Reviewer's guide (collapsed on small PRs)

Reviewer's Guide

Documents how to register the SelectRegions region service by adding a code snippet to the SelectRegions sample page, showing the required AddBootstrapBlazorRegionService() call in the dependency injection setup.

Sequence diagram for registering and using BootstrapBlazor region service

sequenceDiagram
    actor Developer
    participant WebApplicationBuilder
    participant DIContainer
    participant SelectRegions
    participant RegionService

    Developer->>WebApplicationBuilder: ConfigureServices
    WebApplicationBuilder->>DIContainer: builder.Services.AddBootstrapBlazorRegionService
    DIContainer-->>WebApplicationBuilder: RegionService registered

    Developer->>WebApplicationBuilder: Run application
    WebApplicationBuilder->>DIContainer: Resolve SelectRegions
    DIContainer->>SelectRegions: Create instance
    DIContainer->>SelectRegions: Inject RegionService
    SelectRegions-->>Developer: Region selection UI works with RegionService

Loading

File-Level Changes

Change	Details	Files
Add documentation snippet to show required DI service registration for the Region component.	Insert a block with the builder.Services.AddBootstrapBlazorRegionService() example call above the main demo block Normalize the Razor file encoding/BOM at the @page directive line	src/BootstrapBlazor.Server/Components/Samples/SelectRegions.razor

Assessment against linked issues

Issue	Objective	Addressed	Explanation
#7339	Update the SelectRegion component documentation/sample to include an instruction to register the Region service via builder.Services.AddBootstrapBlazorRegionService();.	✅

Possibly linked issues

• SelectRegion 行政区域选择器，官网文档漏了提示builder.Services.AddBootstrapBlazorRegionService(); #7339: The PR adds the missing builder.Services.AddBootstrapBlazorRegionService() doc snippet requested in the SelectRegion issue.
• SelectRegion 行政区域选择器，官网文档漏了提示builder.Services.AddBootstrapBlazorRegionService(); #7339: PR implements the requested SelectRegion documentation by adding the service injection sample code snippet to the demo.

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[sourcery-ai]

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

• The added builder.Services.AddBootstrapBlazorRegionService() snippet should likely include a trailing semicolon to better match valid C# syntax in the documentation.

Prompt for AI Agents

Please address the comments from this code review:

## Overall Comments
- The added `builder.Services.AddBootstrapBlazorRegionService()` snippet should likely include a trailing semicolon to better match valid C# syntax in the documentation.

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[Copilot]

Pull request overview

This PR adds documentation for the service registration method for the SelectRegion component. The documentation shows developers how to register the required service in their application startup code.

• Adds a <Pre> element displaying the service registration method call

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[Copilot]

The service registration method call is missing a semicolon at the end. All similar documentation examples in the codebase (like AddBootstrapHolidayService) include a semicolon to show complete C# syntax.

Suggested change

	<Pre>builder.Services.AddBootstrapBlazorRegionService()</Pre>
	<Pre>builder.Services.AddBootstrapBlazorRegionService();</Pre>

[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 100.00%. Comparing base (09f2226) to head (c4cfaae).
⚠️ Report is 1 commits behind head on main.

Additional details and impacted files

@@            Coverage Diff            @@
##              main     #7342   +/-   ##
=========================================
  Coverage   100.00%   100.00%           
=========================================
  Files          747       747           
  Lines        32760     32760           
  Branches      4540      4540           
=========================================
  Hits         32760     32760           

Flag	Coverage Δ
BB	100.00% <ø> (?)

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