Support TensorRT coversion from Detic?

## 🚀 Feature
Detic model conversion to TensorRT

## Motivation & Examples
Fast inference on production

Start by investigating how Detic models are represented in Detectron2 and whether the repository exposes an existing TensorRT conversion entry point. Compare the current Detic inference path with the production fast-inference goal; done means a documented, working conversion path for Detic models to TensorRT, with validation of inference behavior and performance.

Written by the indexing model from the issue text.