Replace PHPStan ignores with jetbrains/phpstorm-stubs for Redis Streams

[Copilot]

PHPStan was reporting undefined method errors for Redis Streams methods (xAdd, xGroup, xReadGroup, etc.) because the default PHP extension stubs lack these definitions. This was being suppressed with ignoreErrors.

Changes

• Added jetbrains/phpstorm-stubs as dev dependency - provides complete type definitions for Redis Streams methods on RedisCluster
• Configured PHPStan to scan phpstorm-stubs directory
• Removed ignoreErrors section from phpstan.neon that was masking the undefined method warnings

This ensures proper static analysis for Redis Streams operations without suppressing legitimate type checking.

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