BE-013: Add device_type detection from name — "X3B" → ring, "JVC" → band

Track: 1 — MVP
Section: 1.4 Device Registration
Status: [ ] Todo
Repo: backend-api
Branch: feature/BE-013-device-type-detection

Done When

POST /devices with name containing "X3B" auto-sets device_type = "ring". Name containing "JVC" → device_type = "band". Others → device_type = "unknown"

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