feat(syslog): a source's lines to read and search, on its page, its host's and its SNMP device's, and over MCP (#6000)

- /plugins/syslog/sources/<id>: the lines newest first, loading as you
  scroll, filtered by severity and worse, app, text and time, with day
  dividers and times to the second in the reader's zone.
- The Syslog page links each source and shows its lines in the last hour.
- A Syslog panel on a host's page and an SNMP device's: the newest lines of
  the sources bound to it or at its address.
- MCP: list_syslog_sources and search_syslog (source, host, text, severity
  and worse, app, range, paging by next_before).
- Shared: escape_like moves to steward/core/like.py and cut_middle to the
  MCP shaping module, replacing four inline copies; |when takes seconds=.

Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com>

steward/core/formatting.py

@@ -128,18 +128,20 @@ def ago(when: datetime | None, now: datetime | None = None, tz: tzinfo | None =
     return _time(when, when.astimezone(tz or timezone.utc), text)
 
 
-def when(moment: datetime | None, tz: tzinfo | None = None, now: datetime | None = None) -> Markup:
+def when(moment: datetime | None, tz: tzinfo | None = None, now: datetime | None = None,
+         seconds: bool = False) -> Markup:
     """The exact moment in the reader's zone on a 24-hour clock, always with
     its date: 'Thu 8 Oct 06:58' this year, '6 Oct 2025 14:12' before it. A
     list that groups by recency says Today or Yesterday in a divider
-    (day_group), never in place of the date (#5214)."""
+    (day_group), never in place of the date (#5214). `seconds` adds them
+    ('Thu 8 Oct 06:58:12'), for log lines a second apart."""
     if moment is None:
         return Markup(NONE)
     tz = tz or timezone.utc
     moment = _utc(moment)
     local = moment.astimezone(tz)
     this_year = (now or datetime.now(timezone.utc)).astimezone(tz).year
-    day, hm = local.date(), f"{local:%H:%M}"
+    day, hm = local.date(), f"{local:%H:%M:%S}" if seconds else f"{local:%H:%M}"
     if day.year == this_year:
         text = f"{local:%a} {day.day} {local:%b} {hm}"
     else: