Fix: Support repeated query parameter keys in curl generation and request display

[volatilegg]

Summary:

When query parameters contain repeated keys (e.g. ?tag=foo&tag=bar), Alice previously only captured the last value because Uri.queryParameters returns a Map<String, String> which overwrites duplicate keys.

Changes:

• alice_dio_interceptor.dart: Use Uri.queryParametersAll instead of Uri.queryParameters to preserve all values for repeated keys. Single-value lists are flattened to plain strings for backward compatibility.
• alice_http_call.dart: Update getCurlCommand() to detect List values in query parameters and expand them into repeated keys (key=a&key=b) instead of serializing the list as a single value.
• alice_call_request_widget.dart: Update the query parameters UI to display each value on its own row when a key has multiple values. Removed stray print() statement.
• alice_http_request.dart: Updated doc comment on queryParameters to clarify values can be String or List.

Example:

Before: curl ... '...?category=electronics' (only last value)

After: curl ... '...?category=electronics&category=books&category=toys' (all values)