Fix device type inference and add computer category

docs/device-mapper.md

@@ -25,7 +25,7 @@ python3 tools/device_mapper.py find --name 'L55M5-AD' --brand Xiaomi
   - `brand`: normalized brand
   - `manufacturer_brand`: manufacturer-level brand
   - `market_brand`: market sub-brand
-  - `device_type`: `phone | tablet | wear | tv | other`
+  - `device_type`: `phone | tablet | wear | tv | computer | other`
   - `aliases`: all searchable aliases
 - `lookup`: normalized alias -> candidate `record.id[]`
 - `brand_aliases`: normalized brand aliases to filter by app-provided brand
@@ -54,4 +54,5 @@ Supported categories:
 - `tablet`
 - `wear`
 - `tv`
+- `computer`
 - `other`