Refactor Router and ModuleLoader: Decouple module loading from route building

[armanist]

ModuleLoader no longer executes module route closures or builds runtime routes.
It only loads module configs/dependencies and returns module route definition closures.

RouteBuilder is responsible for executing those closures using the existing Route DSL collector
and producing the final runtime routes array that Router expects today.

IMPORTANT:

• This is an incremental refactor and preserves the current public routing API/behavior.
• RouteController/Router still operate on route arrays at this stage.
• Converting routes to a Route object-centric internal representation will be done in a follow-up,
  because it requires coordinated changes across Router matching, RouteController state and helpers.

[codecov]

Codecov Report

❌ Patch coverage is 71.42857% with 12 lines in your changes missing coverage. Please review.
✅ Project coverage is 79.88%. Comparing base (5f481a5) to head (7b0272a).
⚠️ Report is 3 commits behind head on master.

Files with missing lines	Patch %	Lines
src/Console/Commands/OpenApiCommand.php	0.00%	4 Missing ⚠️
src/Console/Commands/RouteListCommand.php	0.00%	4 Missing ⚠️
src/Module/ModuleLoader.php	82.35%	3 Missing ⚠️
src/Router/Route.php	75.00%	1 Missing ⚠️

Additional details and impacted files

@@             Coverage Diff              @@
##             master     #409      +/-   ##
============================================
- Coverage     79.90%   79.88%   -0.02%     
- Complexity     2492     2495       +3     
============================================
  Files           229      230       +1     
  Lines          6609     6623      +14     
============================================
+ Hits           5281     5291      +10     
- Misses         1328     1332       +4     

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