Cancela el análisis: Disable Dart static analysis and linting

[Copilot]

This PR addresses the request to "cancela el analisis" (cancel the analysis) by completely disabling Dart static analysis and linting for the CoinFlow Flutter project.

Changes Made

1. Disabled Static Analysis Configuration

• File: analysis_options.yaml
• Commented out the include: package:flutter_lints/flutter.yaml directive
• Disabled the entire linter: section and its rules
• Added clear Spanish comment "ANÁLISIS CANCELADO" to indicate the analysis has been cancelled

2. Removed Linting Dependency

• File: pubspec.yaml
• Commented out the flutter_lints: ^5.0.0 dev dependency
• Added explanatory comment indicating the dependency was removed due to analysis cancellation

Impact

With these changes:

• ✅ Dart analyzer will no longer perform linting checks
• ✅ IDEs will not show linting warnings or suggestions
• ✅ flutter analyze command will run with minimal analysis
• ✅ Code formatting and style enforcement is disabled
• ✅ Original configuration is preserved as comments for future restoration if needed

Rationale

The changes are minimal and surgical, addressing exactly what was requested - cancelling the analysis functionality while preserving the ability to easily restore it in the future by uncommenting the relevant lines.

All existing functionality of the CoinFlow currency conversion app remains intact, as this change only affects development-time code analysis and not runtime behavior.

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