deprecate(#122): mark WebServicesManager as deprecated

[usernane]

Summary

Mark WebServicesManager as deprecated, completing the ADR-0005 refactoring chain. Step 5 of 5.

Motivation

With RequestProcessor, ErrorResponse, and OpenAPIGenerator in place, WebServicesManager is now a legacy wrapper. New code should use RequestProcessor directly. Fixes #122.

Changes

• Added @deprecated to WebServicesManager class docblock with migration guide
• Added @deprecated to process() and sendResponse() methods
• Updated README Quick Start to show RequestProcessor as the recommended approach
• Registry methods (addService, getServices, etc.) remain undeprecated for backward compat

UI Changes

N/A

How to Test / Verify

php vendor/bin/phpunit tests/

530 tests pass unchanged — full backward compatibility.

Breaking Changes and Migration Steps

None. All existing code continues to work. Deprecation annotations guide migration:

// Before:
$manager = new WebServicesManager();
$manager->addService(new MyService());
$manager->process();

// After:
$processor = new RequestProcessor();
$processor->process(new MyService());

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 #122
Completes ADR-0005: https://github.com/WebFiori/docs/blob/main/adr/0005-request-processor-replaces-manager.md

[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

[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 93.64%. Comparing base (7810da5) to head (489b2d0).
⚠️ Report is 2 commits behind head on dev.

Additional details and impacted files

@@            Coverage Diff            @@
##                dev     #130   +/-   ##
=========================================
  Coverage     93.64%   93.64%           
  Complexity     1316     1316           
=========================================
  Files            39       39           
  Lines          3180     3180           
=========================================
  Hits           2978     2978           
  Misses          202      202           

Flag	Coverage Δ
php-8.3	93.64% <ø> (ø)

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