Rename title from 'Unified Workloads' to 'Multimodal Data Analytics'

Author: BohuTANG

docs/en/guides/54-query/index.md

@@ -1,5 +1,5 @@
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-title: Unified Workloads
+title: Multimodal Data Analytics
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 CityDrive Intelligence records video of every drive. Background processing tools split the video stream into keyframe images, extracting rich multimodal information from each image and storing it by `video_id`. These signals include relational metadata, JSON manifests, behavior tags, vector embeddings, and GPS traces.