Note

Medium Risk
Moderate risk because it swaps core AssetCache/draft status model definitions over to the external flow360-schema package (plus a dependency bump), which can affect serialization/validation behavior and draft persistence if the schema changes are not fully compatible.

Overview
Migrates client/runtime consumers to use schema-owned asset cache and draft status payload models: AssetCache, MirrorStatus, CoordinateSystemStatus (and related coordinate-system assignment models) plus MirrorPlane are now imported from flow360_schema instead of being defined in flow360.

Keeps API compatibility by relaying Transformation from flow360_schema.framework.entity.legacy_transformation after the schema split, and updates param/translator/util code paths to treat schema AssetCache as the skippable container during entity traversal/replacement.

Updates tests to reflect the move (removing validations/tests that were tied to the old in-repo models) and bumps flow360-schema to 0.1.19 in poetry.lock.

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