Add sort_by ordering for the log viewer, with a missing-param fallback/drop toggle (ticket 045)

/api/logs now accepts sort_by (an already-declared param name) and
sort_missing_fallback: lines carrying that param are ordered by its value,
while lines missing it are either appended in ottyl_seq order (fallback,
the default) or dropped from the response. Default ottyl_ts-tracking
order is unchanged when sort_by is omitted.

The log viewer (both the inline panel and its popout) exposes this as a
"Sort by" control next to the column picker, persisted to localStorage
under one shared key (ottyl.logPreview.sort) — the same global-viewer-
setting convention already used for visible param columns and the log
viewer's height, since there's no per-dashboard scope for this to divide
by.

Co-Authored-By: Claude Sonnet 5 <noreply@anthropic.com>
Claude-Session: https://claude.ai/code/session_01XFUNZwCvz3kcod3352ZR2o

src/profile.rs

@@ -1214,6 +1214,8 @@ mod tests {
                 end_ms: None,
                 limit: None,
                 filter: None,
+                sort_by: None,
+                sort_missing_fallback: None,
             }),
         )
         .await