refactor: replace the in-tree DI container with internal/container

[roxblnfk]

What was changed

• The in-tree Service\Container is replaced by internal/container's ObjectContainer (a superset of the old API); yiisoft/injector drops from the root require and stays only as a transitive dependency.
• Config hydration no longer lives in a hard-coded namespace check inside make() — it is a container inflector (ConfigInflector) registered in Bootstrap. Config classes opt in with the #[InflectableConfig] marker attribute instead of relying on their FQCN prefix.
• ConfigInflector and its attributes live under Buggregator\Trap\Application\Config\Internal, ported verbatim from the shared reference implementation so the whole subtree can later be extracted into a package or container module by swapping the namespace alone.

Why?

Several projects carried their own copy of the same container. internal/container is that code, extracted and grown, so Trap moves onto the shared package and keeps config hydration as project code wired back in through an inflector.

Review notes

• internal/container requires PHP >=8.2 while Trap still declares >=8.1 and tests 8.1 in CI; the package requirement is being lowered to >=8.1 separately, so this branch keeps Trap on >=8.1 and does not touch the matrix.
• The only project-specific edit inside the ported inflector is Testo\Common\ErrorReporter → the Trap Logger; everything else is a pure namespace swap.

Checklist

• PHP 8.1 php-internal/container#4
• Tested
  • Tested manually — end-to-end config hydration through the inflector (#[InputOption], #[Env], comma-list arrays)
  • Unit tests added — ConfigInflectorTest (moved from ConfigLoaderTest)

[codecov]

Codecov Report

❌ Patch coverage is 50.00000% with 69 lines in your changes missing coverage. Please review.
✅ Project coverage is 26.91%. Comparing base (a0634a3) to head (bc71895).
⚠️ Report is 1 commits behind head on master.

Files with missing lines	Patch %	Lines
...rc/Application/Config/Internal/ConfigInflector.php	46.22%	57 Missing ⚠️
src/Client/TrapHandle/ContextProvider/Source.php	0.00%	3 Missing ⚠️
...c/Application/Config/Internal/Attribute/PhpIni.php	0.00%	2 Missing ⚠️
...plication/Config/Internal/Attribute/XPathEmbed.php	0.00%	2 Missing ⚠️
...ation/Config/Internal/Attribute/XPathEmbedList.php	0.00%	2 Missing ⚠️
src/Bootstrap.php	0.00%	2 Missing ⚠️
src/Traffic/Dispatcher/Http.php	66.66%	1 Missing ⚠️

Additional details and impacted files

@@             Coverage Diff              @@
##             master     #218      +/-   ##
============================================
- Coverage     27.78%   26.91%   -0.88%     
- Complexity     1403     1411       +8     
============================================
  Files           159      160       +1     
  Lines          4373     4411      +38     
============================================
- Hits           1215     1187      -28     
- Misses         3158     3224      +66     

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