Fix McpApiController namespace and security issues

[Snider]

This submission fixes a critical namespace mismatch in the McpApiController and addresses several security vulnerabilities:

1. Namespace Correction: Updated Mod\Api\Controllers to Core\Mcp\Controllers to align with the package's PSR-4 structure.
2. Authorization: Integrated McpQuotaService to check workspace quotas before tool execution.
3. Rate Limiting: Added a 60 requests per minute rate limit per workspace/IP.
4. Injection Prevention: Refactored proc_open to use an array of arguments, preventing shell command injection.
5. Input Validation: Added regex constraints to server and tool parameters to ensure they follow expected formats.
6. Syntax & Imports: Added RateLimiter and Str imports and verified syntax with php -l.

Fixes #11

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PR created automatically by Jules for task 17974347744158043436 started by @Snider

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QA Pipeline Results

Check	Status	Details
Tests		tests, assertions
PHPStan		errors
Psalm		issues
Code Style		files need formatting
Security		vulnerabilities

Artifacts

• test-results.xml - JUnit test results
• phpstan.json - PHPStan analysis
• psalm.json / psalm.sarif - Psalm analysis
• pint.json - Code style report
• audit.json - Security audit

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Generated by core php qa pipeline

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