🧹 [코드 상태 개선] ConstraintContext dataclass 도입

[seonghobae]

🎯 What: Snowflake introspect 내에 제약조건(Constraint) 정보를 생성하는 함수들의 매개변수를 dataclass(ConstraintContext)로 그룹화하였습니다.
💡 Why: _build_primary_key, _build_unique_constraint, _build_foreign_key 함수들이 7개의 동일한 인자(name, schema, table, relation_oid, columns, constrained_attnums, constraint_oid)를 반복해서 받고 있어 유지보수성과 가독성을 저하시키고 있었습니다. 이를 개선하기 위해 공통 매개변수를 캡슐화하는 ConstraintContext 클래스를 도입하였습니다.
✅ Verification: 리팩토링 후 backend/tests/test_snowflake_introspect.py 및 backend/tests/test_snowflake_introspect_coverage.py 테스트를 모두 통과하여 기존 기능이 안전하게 유지됨을 확인하였습니다.
✨ Result: 매개변수 개수가 크게 줄어들고 코드의 복잡성이 감소하여 가독성과 유지보수성이 향상되었습니다.

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PR created automatically by Jules for task 16078299856292260269 started by @seonghobae

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• backend/app/snowflake_introspect/introspect.py

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[seonghobae]

Closing as a duplicate of PR #814. Both encapsulate the same seven constraint-builder arguments and update the same primary/unique/foreign-key paths. #814 keeps the implementation-only type private and avoids competing edits to the same constraint compiler. This branch provides no distinct acceptance evidence.

[google-labs-jules]

Closing as a duplicate of PR #814. Both encapsulate the same seven constraint-builder arguments and update the same primary/unique/foreign-key paths. #814 keeps the implementation-only type private and avoids competing edits to the same constraint compiler. This branch provides no distinct acceptance evidence.

Understood. Acknowledging that this work is a duplicate of PR #814 and stopping work on this task.