[Fix] fix data-permission namespace problem

[VampireAchao]

1. "Use @Length(max = to validate the length of a String instead of @Max(value = because @Max only verifies numbers."

2. "Do not query dataPermission when selectorIds is empty."

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• [x] You submit test cases (unit or integration tests) that back your changes.
• [x] Your local test passed ./mvnw clean install -Dmaven.javadoc.skip=true.