Address ZeizaZach's review of the developer staff role:
- Nudge the developer log query to exclude private chat and sender IPs
(the ModeratorCommand path still sees everything).
- Deduplicate Command_GetLogHistory into Command_ViewLogHistory, which now
extends both ModeratorCommand (ext) and DeveloperCommand (dev_ext); the
client picks the DeveloperCommand-scoped extension by extendee, and the
server reads it via the extension number.
- Pull the uptime snapshot SQL into Servatrice_DatabaseInterface as
getLatestUptimeSnapshot() and widen the reported counters to 64-bit.
- Document the admin bitfield (1 admin, 2 moderator, 4 judge, 8 developer)
and add a server-side test for the developer command path.
