Reduce static analysis baselines

[dmetzner]

Summary

• remove the PHPStan baseline and keep PHPStan green without it
• reduce the remaining static-analysis noise with targeted type and null-safety fixes across controllers, entities, commands, and tests
• keep Psalm baseline-backed for now because a no-baseline run still reports hundreds of issues

Verification

• bin/phpstan analyze --no-progress --debug
• bin/psalm --config=.psalm-no-baseline.xml --no-progress --threads=1 --scan-threads=1 --no-cache (investigation only: still reports 510 errors without a baseline)

[codecov]

Codecov Report

❌ Patch coverage is 43.45404% with 203 lines in your changes missing coverage. Please review.
✅ Project coverage is 56.03%. Comparing base (9188359) to head (d0125cb).
⚠️ Report is 7 commits behind head on develop.

Files with missing lines	Patch %	Lines
src/System/Testing/Behat/ContextTrait.php	53.96%	29 Missing ⚠️
.../Projects/ApproveProjects/ApproveProjectsAdmin.php	0.00%	17 Missing ⚠️
src/System/Commands/MigrateRemixGraphsCommand.php	0.00%	16 Missing ⚠️
src/System/Commands/Reset/ResetCommand.php	0.00%	16 Missing ⚠️
.../Projects/SpecialProjects/FeaturedProjectAdmin.php	0.00%	13 Missing ⚠️
src/Admin/Projects/ProjectPreUpdateTrait.php	0.00%	11 Missing ⚠️
...n/Projects/SpecialProjects/ExampleProjectAdmin.php	0.00%	10 Missing ⚠️
src/Admin/ApkGeneration/ApkController.php	0.00%	8 Missing ⚠️
src/Api/CommentsApi.php	68.00%	8 Missing ⚠️
src/Api/ProjectsApi.php	50.00%	8 Missing ⚠️
... and 24 more

Additional details and impacted files

@@              Coverage Diff              @@
##             develop    #6319      +/-   ##
=============================================
- Coverage      56.20%   56.03%   -0.17%     
- Complexity      9171     9179       +8     
=============================================
  Files            784      784              
  Lines          29093    29256     +163     
=============================================
+ Hits           16351    16394      +43     
- Misses         12742    12862     +120     

Flag	Coverage Δ
behat	53.79% <42.89%> (-0.16%)	⬇️
phpunit	10.89% <8.67%> (+<0.01%)	⬆️

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