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>

plugins/syslog/__init__.py

@@ -34,7 +34,12 @@ def get_nav() -> list[dict]:
     return [{"label": "Syslog", "href": "/plugins/syslog/"}]
 
 
+def register_mcp_tools(register) -> None:
+    from .mcp_tools import register_tools
+    register_tools(register)
+
+
 def get_audit_entities() -> dict:
     """Audit rows about a source name it and link to the Syslog page."""
     from .models import SyslogSource
-    return {"syslog_source": (SyslogSource, "/plugins/syslog/")}
+    return {"syslog_source": (SyslogSource, "/plugins/syslog/sources/{}")}