feat: add $consider (UP/DOWN) toggle to query builder and evaluators

apps/monitor/src/query.rs

@@ -50,6 +50,17 @@ pub struct Response {
 pub fn evaluate(query: &Value, response: &Response) -> Result<bool> {
     match query {
         Value::Object(map) => {
+            // $consider — "up" (default) or "down": flips result if conditions match
+            if let Some(consider) = map.get("$consider") {
+                let is_down = consider.as_str() == Some("down");
+                let rest: serde_json::Map<String, Value> = map.iter()
+                    .filter(|(k, _)| k.as_str() != "$consider")
+                    .map(|(k, v)| (k.clone(), v.clone()))
+                    .collect();
+                let matches = evaluate(&Value::Object(rest), response).unwrap_or(false);
+                return Ok(if is_down { !matches } else { matches });
+            }
+
             // $and / $or / $not
             if let Some(and) = map.get("$and") {
                 let Value::Array(clauses) = and else { bail!("$and expects array") };