fix: off-by-one in middleware after() and afterSend() loops

[usernane]

Summary

Fix off-by-one error in middleware after() and afterSend() loop conditions in App::start(), which caused these methods to be skipped when only one middleware is assigned to a route.

Motivation

When a route has a single middleware, count($mdArr) - 1 = 0 and the loop condition $x > 0 evaluates to false immediately, so after() and afterSend() are never called. Fixes #299.

Changes

• Changed loop condition from $x > 0 to $x >= 0 in the afterSend() loop (line 167)
• Changed loop condition from $x > 0 to $x >= 0 in the after() loop (line 178)

How to Test / Verify

• Assign a single middleware to a route and verify that after() and afterSend() are called
• Existing test suite passes (672 tests, all non-DB tests green)

Breaking Changes and Migration Steps

None

Checklist

• I reviewed my own diff before requesting review
• My commits follow Conventional Commits
• The title of the pull request follows Conventional Commits
• I added/updated tests (or explained why not)
• I updated docs (if needed)
• I ran lint/cs-fixer (if applicable)
• I considered backward compatibility
• I considered security

Related issues

Closes #299

[codecov]

Codecov Report

❌ Patch coverage is 0% with 2 lines in your changes missing coverage. Please review.
✅ Project coverage is 74.88%. Comparing base (9a039f9) to head (1faf4a1).
⚠️ Report is 9 commits behind head on main.

Files with missing lines	Patch %	Lines
WebFiori/Framework/App.php	0.00%	2 Missing ⚠️

Additional details and impacted files

@@            Coverage Diff            @@
##               main     #304   +/-   ##
=========================================
  Coverage     74.88%   74.88%           
  Complexity     2974     2974           
=========================================
  Files            97       97           
  Lines          9509     9509           
=========================================
  Hits           7121     7121           
  Misses         2388     2388           

Flag	Coverage Δ
php-8.1	76.20% <0.00%> (ø)
php-8.2	76.16% <0.00%> (ø)
php-8.3	74.95% <0.00%> (ø)
php-8.4	74.95% <0.00%> (ø)
php-8.5	74.86% <0.00%> (ø)

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[sonarqubecloud]

Quality Gate passed

Issues
0 New issues
0 Accepted issues

Measures
0 Security Hotspots
0.0% Coverage on New Code
0.0% Duplication on New Code

See analysis details on SonarQube Cloud