Support Logformat like json or logfmt

[wrenix]

Specific Demand

if i have to parse the logs i have to write an regex.
i would prefer json or logfmt which are well formated and parse able logs

Implement Suggestion

use just the default tracing_subscriber library for such formats:

• json part of tracing-subscriber
• logfmt

more inforamation e.g.: https://oneuptime.com/blog/post/2026-01-25-structured-json-logs-tracing-rust/view

to configure in dufs, maybe just set --log-format=json or --log-format=logfmt