feat: watcher agent management system implemented.

backend/templates_config.py

@@ -60,6 +60,19 @@ def jinja_same_date(dt1, dt2) -> bool:
         return False
 
 
+def jinja_log_tail_display(s):
+    """Jinja filter: decode a JSON-encoded log tail array into a plain-text string."""
+    if not s:
+        return ""
+    try:
+        lines = _json.loads(s)
+        if isinstance(lines, list):
+            return "\n".join(str(l) for l in lines)
+        return str(s)
+    except Exception:
+        return str(s)
+
+
 # Register Jinja filters and globals
 templates.env.filters["local_datetime"] = jinja_local_datetime
 templates.env.filters["local_time"] = jinja_local_time
@@ -68,3 +81,4 @@ templates.env.filters["fromjson"] = jinja_fromjson
 templates.env.globals["timezone_abbr"] = jinja_timezone_abbr
 templates.env.globals["get_user_timezone"] = get_user_timezone
 templates.env.globals["same_date"] = jinja_same_date
+templates.env.filters["log_tail_display"] = jinja_log_tail_display