Persian support

Persian is a first-class language in llm-search-eval, next to English.

• Arabic ي and ك are unified with Persian ی and ک; Persian and Arabic-Indic digits become ASCII digits.
• Diacritics, tatweel, and directional marks are removed, and the zero width non-joiner is treated as a word boundary.
• Query language is detected from the script when lang is missing, and reports break down the primary metric by language.
• The LLM judge prompt states the query language and counts translations and transliterations between Persian and English as matches.