<fix>[ai]: ZSTAC-69021 prevent capacity quota oversubscription

[zstack-robot-2]

Summary

Prevent AI model, dataset, and model-service downloads from exceeding project capacity quotas by persisting in-flight capacity reservations.

Changes

• Add the AICapacityReservationVO schema for atomic in-flight quota accounting.
• Keep the schema compatible with the MySQL 5.5 verify-case environment.

Testing

• ./runMavenProfile premium in Docker/JDK 8 (BUILD SUCCESS; build tests skipped)
• Designated AICapacityQuotaReservationCase (1 passed, 0 failed, 0 skipped)
• Rebased onto latest 5.5.38

Resolves: ZSTAC-69021

sync from gitlab !10812

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