Use the API plugin marketplace for Amazon Bedrock (#34931)

## Why

Amazon Bedrock configurations can operate without Codex auth, so auth mode alone
cannot determine which curated plugin marketplace to expose.

## What changed

- Pass the resolved model provider into plugin configuration.
- Select `openai-api-curated` when the resolved provider is `amazon-bedrock`,
  while retaining API-key auth as a selection signal.
- Cover provider overrides and app-server plugin listing without an `auth.json`
  file.

GitOrigin-RevId: 972a22e19c41490d8b19d989da052302dc30e8f2

codex-rs/core/src/config/mod.rs

@@ -1535,6 +1535,7 @@ impl Config {
     pub fn plugins_config_input(&self) -> PluginsConfigInput {
         PluginsConfigInput::new(
             self.config_layer_stack.clone(),
+            self.model_provider_id.clone(),
             self.features.enabled(Feature::Plugins),
             self.features.enabled(Feature::RemotePlugin),
             self.chatgpt_base_url.clone(),