Add safe condition checks

[bnvnvnv]

Summary

Add a safe select option and extend safe condition validation to avoid accidental full-table operations when upstream passes empty parameters.

• add safeSelect configuration and wire it into object and Example select providers
• require object-based CRUD safety checks to have at least one effective WHERE condition
• make Example safety checks reject empty condition values, including null, empty string, empty collection, and empty array
• cover tk.mybatis Example and generated Example styles in tests

Validation

• mvn -pl base -am -Dtest=SafeSelectByFieldTest,SafeDeleteByFieldTest,SafeDeleteByMethodTest,SafeUpdateByFieldTest,SafeUpdateByMethodTest -DfailIfNoTests=false -Dsurefire.failIfNoSpecifiedTests=false test
• mvn -pl base -am -DfailIfNoTests=false test
• git diff --check