fix: GoRouter doesn't like subroutes for external links

[g123k]

Hi everyone,

I don't really understand why, but for the external links, GoRouter only works with:

• Path parameters and not queries
• The route must be a root one and not a sub route of /

I will fix #5702

[codecov-commenter]

Codecov Report

Attention: Patch coverage is 0% with 4 lines in your changes missing coverage. Please review.

Project coverage is 6.79%. Comparing base (4d9c7fc) to head (dde826e).
Report is 362 commits behind head on develop.

Files with missing lines	Patch %	Lines
.../smooth_app/lib/pages/navigator/app_navigator.dart	0.00%	4 Missing ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##           develop   #5706      +/-   ##
==========================================
- Coverage     9.54%   6.79%   -2.76%     
==========================================
  Files          325     404      +79     
  Lines        16411   21578    +5167     
==========================================
- Hits          1567    1466     -101     
- Misses       14844   20112    +5268     

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[teolemon]

thanks @g123k