Add Urdu → Devanagari script transliteration for Jalandhry translation

[Copilot]

Adds pipeline support to transliterate the Urdu Quran text (Fateh Muhammad Jalandhry) from Nastaliq/Arabic script into Devanagari, producing output/quran_devanagari_jalandhry.txt.

New module: src/urdu_to_devanagari.py

Character-level transliteration engine covering:

• Extended Devanagari for Urdu-specific phonemes: ق→क़, خ→ख़, غ→ग़, ز→ज़, ف→फ़
• Aspirated consonant pairs via do-chashmi-he (ھ): ب+ھ→भ, پ+ھ→फ, ک+ھ→ख, گ+ھ→घ, etc.
• Long vowel matras: ا→ा/अ, آ→आ, و→ो/व, ی→ी/य, ے→े/ए (consonant vs. vowel position distinguished)
• Retroflex consonants: ٹ→ट, ڈ→ड, ڑ→ड़
• Noon Ghunna ں→ं (anusvara), punctuation (،→,, ؟→?, ۔→।)
• Verbatim preservation of ﷺ, ؑ, ؓ

Changes to src/gentxtforquran.py

• Imports transliterate_urdu from the new module
• Adds ('data/ur.jalandhry.txt', 'output/quran_devanagari_jalandhry.txt', ..., 'Urdu-Devanagari') to the translations list
• Adds header (Quran - Urdu Tarjuma (Devanagari Lipi)) and processing branch that pipes each ayah through transliterate_urdu() before writing

The generated file matches the source structure line-for-line (6582 lines, 114 Surahs), with no residual Arabic-script characters outside the intentionally preserved Unicode symbols.

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