Add PaddleOCR-VL 1.6 to the llama.cpp OCR model list

[niksedk]

Adds PaddlePaddle's official llama.cpp package of PaddleOCR-VL 1.6 (NaViT + ERNIE-4.5, 109 languages; model + mmproj, 1.8 GB total) as a third entry in the llama.cpp OCR model list, alongside GLM-OCR and LightOnOCR. One list entry — the existing download/server/OCR plumbing handles the rest.

This restores the 109-language PaddleOCR-VL option that was evaluated and dropped from the CrispEmbed backend list in #12366 (broken there in CrispEmbed v0.14.0's integration — this verification confirms the model family itself is fine when run through llama.cpp).

Verification (headless, pinned llama.cpp b9833, Apple M4)

Driven through SE's actual LlamaCppServerManager.EnsureServerRunningAsync + LlamaCppOcr code path:

• Real Blu-ray sup (alien4.sup, 6 lines sampled across the movie): 6/6 exact, 0.3–4.3 s/line
• Synthetic subtitle image ("Hello world, this is a test.", white on black): exact — notably the same image CrispEmbed's Paddle path truncated
• Multi-line Danish/Spanish/French with accents and italics: line break and text exact, one diacritic slip (Àh for Åh)

Full UI test suite passes (608 tests).

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