Add OpenAI options and implement embedding functionality in memory se…

[239573049]

This pull request introduces a new IsEmbedded property to the DocumentFileItem and Warehouse entities, removes unused OpenAI-related fields from the Warehouse entity, and includes the necessary database migration files to reflect these changes. These updates aim to streamline the data model and add functionality for tracking embedded status.

Entity Updates:

• Added a new bool IsEmbedded property to the DocumentFileItem class to indicate whether embedding is complete (KoalaWiki.Domains/DocumentFile/DocumentFileItem.cs).
• Added a new bool IsEmbedded property to the Warehouse class and removed the unused Model, OpenAIKey, and OpenAIEndpoint properties (KoalaWiki.Domains/Warehouse.cs).

Database Migrations:

• Added a migration file (20250506101108_AddEmbedded) to add the IsEmbedded column to the DocumentFileItems and Warehouses tables, and remove the Model, OpenAIKey, and OpenAIEndpoint columns from the Warehouses table (Provider/KoalaWiki.Provider.PostgreSQL/Migrations/20250506101108_AddEmbedded.cs, Provider/KoalaWiki.Provider.PostgreSQL/Migrations/20250506101108_AddEmbedded.Designer.cs). [1] [2]
• Updated the PostgreSQLContextModelSnapshot to include the IsEmbedded property for both DocumentFileItems and Warehouses, and removed the OpenAI-related properties (Provider/KoalaWiki.Provider.PostgreSQL/Migrations/PostgreSQLContextModelSnapshot.cs). [1] [2]…rvices