feat(validation): implement global input validation and sanitization pipeline

[JuanVP2]

Closes #106

Summary

Introduced a comprehensive Input Validation and Sanitization infrastructure for alian_structure-api. This update enforces OWASP input hygiene standards, RFC 5322 email validation, deep payload sanitization against XSS and SQL injection, and structured HTTP 400 Bad Request exception formatting.

Key Changes

• Global Pipes: Configured global SanitizePipe and ValidationPipe with whitelist: true, transform: true, and custom error payload formatting.
• Payload Sanitization: Implemented deep recursive string trimming, Unicode normalization (NFC), HTML/script tag stripping, and SQL injection pattern sanitization.
• Custom Decorators: Created @IsRfcEmail for strict email validation alongside @Trim and @Sanitize field transformer decorators.
• Automated Testing: Added unit specs for pipes/decorators and end-to-end integration tests verifying request filtering and structured 400 error responses.

[memplethee-lab]

@JuanVP2 Please resolve conflict Thank you

[memplethee-lab]

@JuanVP2 Please resolve conflict Thank you