* add immich_model
* graph per shape
* decouple ocr from ort
* prepared graphs
* use f16 for accelerators
* preload all shapes
* warm-up pass after preload
* keep precision for fp32 graphs
* ensure padding for text recognition
* optimize postprocessing for fp16 outputs
* handle raw ctc logits
* use f16 output for rknn
* mmap token embedding
* read device metadata