fix: update set_backend_deps.sh to use latest deps image

[whhe]

Fix #57

[Copilot]

Pull request overview

Updates the backend dependency staging script to better align with the current infiniflow/ragflow_deps:latest image contents, addressing Issue #57 where the script failed due to a missing file in the container.

Changes:

• Removes the docker cp step for the missing huqie.txt.trie file.
• Removes the LIGHTEN-gated copying of local embedding model directories to ~/.ragflow.
• Removes copying of the tika-server-standard-3.0.0.jar (and its .md5) from the deps image.

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