feat(fact_image): add Bengali text auto-detection and font support

feat: Ultrafast preset for all modules, Text Story margin fix, Quiz Explain box improvements

feat: Major optimizations - Quiz dynamic fonts, TTS 1.2x speed, Video stream copy (10x faster), Single API call, Fact Image dynamic fonts, Text Story position fix

style: Increase fact image text padding by 8px on each side

fix: Text Story UI positioning, Fact Image heading background alignment

feat: Multiple updates - HTML optimization, dual API search, text story tuning, Messenger UI

Update text layout: Heading at 40%, Fact text at 50% from top

Increase side padding to 80px for better text margin

Major layout update: heading 80px uppercase at top 15%, fact text 60px bold, 80px gap

Update font sizes: heading 65px, fact text 53px, 4 words per line

Add heading with background support: centered layout, heading BG, fact text outline/shadow

Pexels: select FIRST most relevant photo instead of random

Fix Pexels import path and simplify image prompt

Simplify image prompt: remove confusing keywords, clear NO TEXT instruction

Fix HF storage: correct import (get_hf_storage) and upload_video args

Fix fact_creator: correct API signatures (NVIDIA/CF/Pexels), ensure 9:16 video output

Add Fact-Image module: generate videos with fact text overlay on AI images