didier e700a81c25 Add versioning, update tool, and soft-delete ...

Schema: public_id + version columns with UNIQUE constraint,
delete_timestamp for soft-delete.

Tools: store_flashcard accepts optional public_id, update_flashcard
creates a new version preserving history, delete_flashcard inserts
a tombstone row and removes the Qdrant point.

Qdrant: point ID is public_id (only latest version indexed).

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..

000001_create_flashcard.sql

Add versioning, update tool, and soft-delete

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000002_add_versioning.sql

Add versioning, update tool, and soft-delete

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000003_add_delete_timestamp.sql

Add versioning, update tool, and soft-delete

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