fix(SchemaBuilder): qualify tables with default schema

[elpete]

Summary

• qualify SchemaBuilder table and view names with defaultSchema
• preserve explicitly qualified names and use their schema for existence checks
• keep generated constraint names based on the unqualified table name
• schema-qualify Oracle sequences and triggers without embedding the schema in their generated names
• cover default schemas, explicit schema precedence, Oracle auto-increment objects, drops, and existence checks

Validation

• tests written first and confirmed failing
• Lucee 6 full suite: 2,922 passed, 0 failed, 0 errors, 3 skipped
• box run-script format:check
• git diff --check

Fixes #264