Support multiple query values for search bangs

### Description

Currently, search bangs in `glance` accept a single query, which is substituted into the URL as `{QUERY}`. Some services, however, require multiple pieces of information from the query such as source and target languages for translation.

The goal of this feature is to allow a single bang shortcut to parse multiple values from the user input and map them into the URL as needed. This would make search bangs more flexible and powerful, enabling structured queries without requiring separate shortcuts for each variation.

Example: Google Translate

```yaml
- title: Google Translate
shortcut: "!tl"
url: "https://translate.google.com/?sl={QUERY}&tl={QUERY}&text={QUERY}&op=translate"
```

I’ll be working on this feature and would appreciate any feedback along the way.

Start by tracing how search bangs currently substitute {QUERY} in glance and compare that behavior with the Google Translate example. Define how multiple input values should be parsed and mapped to repeated placeholders, then verify the resulting shortcut URL.

Written by the indexing model from the issue text.