feat: 추천 미션 지출 추정 정보 추가

[hoooonshub]

연결 이슈

• Closes feat: 추천 미션의 기준 지출액·예상 절약액 정책 및 정보 제공 #35

작업 내용

1. 정책 기반 지출 추정과 LLM 절감 안내문 생성·검증·폴백을 추가했습니다.
2. 초안·확정·목록 API에 expenseEstimate, savingsDescription, savingsCopyVersion을 추가했습니다.

DB 스키마 변경

1. mission_draft_template: 기준/대안 지출 라벨·금액, expense_unit, estimate_basis를 nullable로 추가하고 금액 관계 CHECK 제약을 추가했습니다.
2. mission_draft, mission: 정책값 스냅샷, 단위당 절감액, 안내문, 문구 source/version 컬럼을 nullable로 추가했습니다.
3. 배달음식→집밥 정책값은 13,000원 / 8,000원 / 5,000원이며, 기존 행은 null로 보존합니다.

검증

• MissionSavingsDescriptionGeneratorTest: 통과
• MissionGenerationAcceptanceTest: 통과
• MissionSurveyAcceptanceTest: 통과 (V12 기대값 갱신)

리스크 및 후속 작업

• 다른 소비 유형과 4주 단위 미션의 정책값·기간 환산은 별도 정책 확정 후 확장합니다.

[coderabbitai]

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Review details

⚙️ Run configuration

Configuration used: Organization UI

Review profile: CHILL

Plan: Pro Plus

Run ID: ea247032-e6d1-4797-a557-48dbf6b16c3d

📥 Commits

Reviewing files that changed from the base of the PR and between 3edaa6d and 57f5ca1.

📒 Files selected for processing (20)

• api/src/main/kotlin/backend/yapp/api/mission/generation/dto/MissionGenerationResponses.kt
• api/src/main/kotlin/backend/yapp/api/mission/lifecycle/dto/MissionLifecycleDtos.kt
• api/src/test/kotlin/backend/yapp/api/mission/generation/MissionGenerationAcceptanceTest.kt
• api/src/test/kotlin/backend/yapp/api/mission/survey/MissionSurveyAcceptanceTest.kt
• core/src/main/kotlin/backend/yapp/core/mission/generation/domain/Mission.kt
• core/src/main/kotlin/backend/yapp/core/mission/generation/domain/MissionDraft.kt
• core/src/main/kotlin/backend/yapp/core/mission/generation/domain/MissionDraftTemplate.kt
• core/src/main/kotlin/backend/yapp/core/mission/generation/port/MissionDraftGenerationPorts.kt
• core/src/main/kotlin/backend/yapp/core/mission/generation/service/DatabaseMissionDraftCandidateProvider.kt
• core/src/main/kotlin/backend/yapp/core/mission/generation/service/MissionGenerationExecutor.kt
• core/src/main/kotlin/backend/yapp/core/mission/generation/service/MissionGenerationModels.kt
• core/src/main/kotlin/backend/yapp/core/mission/generation/service/MissionGenerationService.kt
• core/src/main/kotlin/backend/yapp/core/mission/generation/service/MissionLifecycleService.kt
• core/src/main/kotlin/backend/yapp/core/mission/generation/service/PersonalizedMissionDraftCandidateProvider.kt
• core/src/test/kotlin/backend/yapp/core/mission/generation/service/MissionGenerationExecutorTest.kt
• infra/src/main/kotlin/backend/yapp/infra/mission/generation/MissionAiInfrastructureConfig.kt
• infra/src/main/kotlin/backend/yapp/infra/mission/generation/MissionGenerationProperties.kt
• infra/src/main/kotlin/backend/yapp/infra/mission/generation/MissionSavingsDescriptionGenerator.kt
• infra/src/main/resources/db/migration/V12__add_mission_expense_estimate_policy.sql
• infra/src/test/kotlin/backend/yapp/infra/mission/generation/MissionSavingsDescriptionGeneratorTest.kt

✨ Finishing Touches

🧪 Generate unit tests (beta)

• Create PR with unit tests
• Commit unit tests in branch feat/35-mission-expense-estimate

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