feat: configurable log timezone

[chiefmojo]

Problem

All log timestamps are hardcoded to UTC via Pino's formatters.level path — there's no way for operators in other timezones to get local timestamps without post-processing logs.

Changes

• Adds logging.timezone config field (IANA zone string, default "UTC")
• Logger initializer reads the field and passes it to Pino as timestamp: () => \,"time":"${new Date().toLocaleString('en-CA', { timeZone, hour12: false })}"``
• Schema validation rejects invalid IANA zones with config_invalid
• Tests cover UTC default, valid custom zones, and invalid zone rejection

Config example

logging:
  timezone: America/Los_Angeles

Depends on fix/daemon-init-logger (#1955) — without initLogging: true in the bridge the timezone config is never read.