doc(readme): correct demo address

[kimdiego2098]

Issues

close #6431

Summary by Sourcery

Fix the broken ThingsGateway website links in the Chinese README and add a direct portal link

Documentation:

• Correct the image hyperlink by removing the duplicate "https://"
• Add a clickable text link to the ThingsGateway site after the Bootstrap Blazor description

[sourcery-ai]

Reviewer's Guide

This pull request fixes malformed hyperlinks in the Chinese README by correcting the duplicated protocol in the image link and adding a portal link to the text description.

File-Level Changes

Change	Details	Files
Corrected image hyperlink URL	Removed extra “https://” in the href attribute Updated image link to point to https://thingsgateway.cn	README.zh-CN.md
Added portal link to description text	Appended “传送门” after the Bootstrap Blazor integration sentence	README.zh-CN.md

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[bb-auto]

Thanks for your PR, @kimdiego2098. Someone from the team will get assigned to your PR shortly and we'll get it reviewed.

[sourcery-ai]

Hey @kimdiego2098 - I've reviewed your changes and they look great!

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[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 100.00%. Comparing base (9328c8a) to head (b907707).
Report is 1 commits behind head on main.

Additional details and impacted files

@@            Coverage Diff            @@
##              main     #6430   +/-   ##
=========================================
  Coverage   100.00%   100.00%           
=========================================
  Files          746       746           
  Lines        32225     32225           
  Branches      4554      4554           
=========================================
  Hits         32225     32225           

Flag	Coverage Δ
BB	100.00% <ø> (?)

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