GOR-002: Add Godzilla device type to backend — update device_type enum and auto-detection

Track: 1 — MVP
Section: 1.61 Godzilla Device Integration
Status: [ ] Todo
Repo: backend-api
Branch: feature/GOR-002-device-type-backend

Done When

Migration adds "godzilla" to device_type. POST /devices with name containing "Godzilla" auto-sets device_type = "godzilla". Existing device tests pass

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