update the embedding_type to embedding_label

[shixiao-coder]

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[gemini-code-assist]

Code Review

This pull request renames embedding_type to embedding_label across the ingestion-helper pipeline, including the SQL schema, configuration, routes, utilities, and tests. Feedback on the changes highlights that this renaming is a breaking change for existing deployments configuring EMBEDDING_SPECS via environment variables. It is recommended to support both keys and normalize embedding_type to embedding_label during parsing to maintain backward compatibility.

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[codacy-production]

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