Fix 2p->20s + 20 bugs: pad audio, OCR/ASR coverage gates, TTS cache/placeholder, omni cloud, ASS escape, timeout, preflight, pool locks, SSRF guards

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fix: ZeroGPU quota -> Client(token=HF_TOKEN) thay vì hf_token (đã set secret HF_TOKEN, test Gradio+token 101KB OK)

fix: OmniVoice Cloud 404 -> dùng Gradio client (/gradio_fn) thay vì FastAPI /v1/generate (đã verify 83KB wav OK, semaphore 2)

feat: tích hợp giọng OmniVoice mới (fun_male/story_male/meme_male/calm_fun_male) + Cloud API https://hoangtaiii-omnivoice.hf.space — đồng bộ 100% với D:\omnivoice - web

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Upload cloud_tts.py

Update app/core/cloud_tts.py

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