[apps] Add tool_suggest tool. (#14287)

- [x] Add tool_suggest tool.
- [x] Move chatgpt/src/connectors.rs and core/src/connectors.rs into a
dedicated mod so that we have all the logic and global cache in one
place.
- [x] Update TUI app link view to support rendering the installation
view for mcp elicitation.

---------

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codex-rs/core/src/tools/code_mode.rs

@@ -18,6 +18,7 @@ use crate::tools::context::ToolPayload;
 use crate::tools::js_repl::resolve_compatible_node;
 use crate::tools::router::ToolCall;
 use crate::tools::router::ToolCallSource;
+use crate::tools::router::ToolRouterParams;
 use crate::truncate::TruncationPolicy;
 use crate::truncate::formatted_truncate_text_content_items_with_policy;
 use crate::truncate::truncate_function_output_items_with_policy;
@@ -408,9 +409,12 @@ async fn build_nested_router(exec: &ExecContext) -> ToolRouter {
 
     ToolRouter::from_config(
         &nested_tools_config,
-        Some(mcp_tools),
-        None,
-        exec.turn.dynamic_tools.as_slice(),
+        ToolRouterParams {
+            mcp_tools: Some(mcp_tools),
+            app_tools: None,
+            discoverable_tools: None,
+            dynamic_tools: exec.turn.dynamic_tools.as_slice(),
+        },
     )
 }