Revert "feat: grouped query builder with $upIf/$downIf condition groups"

This reverts commit 99b59070a2.

apps/monitor/src/query.rs

@@ -50,17 +50,6 @@ pub struct Response {
 pub fn evaluate(query: &Value, response: &Response) -> Result<bool> {
     match query {
         Value::Object(map) => {
-            // $upIf / $downIf — named groups, $downIf takes precedence
-            if map.contains_key("$upIf") || map.contains_key("$downIf") {
-                if let Some(down) = map.get("$downIf") {
-                    if evaluate(down, response).unwrap_or(false) { return Ok(false); }
-                }
-                if let Some(up) = map.get("$upIf") {
-                    return evaluate(up, response);
-                }
-                return Ok(true); // only $downIf set and didn't match → up
-            }
-
             // $and / $or / $not
             if let Some(and) = map.get("$and") {
                 let Value::Array(clauses) = and else { bail!("$and expects array") };