chore(PdfReader): support Watermark component

[ArgoZhang]

Link issues

fixes #5811

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

Enable watermark functionality for the PdfReader component within the BootstrapBlazor.Server project.

Enhancements:

• Add support for using the Watermark component with the PdfReader.

Build:

• Update the server project file to integrate the Watermark component.

[sourcery-ai]

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[sourcery-ai]

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

Overall Comments:

• This pull request appears to be missing the implementation code for the Watermark component support described in the title.

Here's what I looked at during the review

• 🟢 General issues: all looks good
• 🟢 Security: all looks good
• 🟢 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 (43cbd10) to head (4db971b).
Report is 1 commits behind head on main.

Additional details and impacted files

@@            Coverage Diff            @@
##              main     #5918   +/-   ##
=========================================
  Coverage   100.00%   100.00%           
=========================================
  Files          665       665           
  Lines        30485     30485           
  Branches      4345      4345           
=========================================
  Hits         30485     30485           

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