[Studio] Validate LiteTopic TTL update requests

[Aias00]

Summary

• enable bean validation on LiteTopic TTL update requests
• require a topic pattern and positive TTL before invoking service logic
• add controller tests for missing topic pattern and non-positive TTL

Scope

• RocketMQ Studio contest scope: Track 1 / META-01 LiteTopic management
• Does not introduce RocketMQ Namespace behavior

Tests

• JAVA_HOME=/Users/aias/Library/Java/JavaVirtualMachines/openjdk-21.0.2/Contents/Home mvn -q -Dtest=LiteTopicControllerTest,LiteTopicServiceTest test
• JAVA_HOME=/Users/aias/Library/Java/JavaVirtualMachines/openjdk-21.0.2/Contents/Home mvn -q test
• git diff --check

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[Aias00]

Superseded by #634. Consolidated with related instance resource action validation changes to reduce review overhead while preserving the same scoped fixes and tests.