This PR enables support for multi-verse tafsirs in the /verses/by_key endpoint.

🔧 Fix Summary:

• Removes the .one_verse constraint from VersesPresenter tafsir filtering logic.
• Adds load_tafsirs method in VerseFinder, which joins tafsirs by checking whether the verse's id falls between start_verse_id and end_verse_id.
• Prepares the system to support tafsirs like Ibn Kathir (ID 169), which span multiple verses (e.g., 2:1–2:5).
• Keeps tafsir loading conditional using params[:tafsirs], avoiding overhead on unrelated endpoints.

Summary for list chapters API

• eager load recitations' own translated names
• add regression test for chapter_reciters endpoint

✅ Implementation Notes:

• The verse-to-tafsir join is now range-aware.
• Local testing was limited to basic verse lookups (/v4/verses/by_key/2:2?tafsirs=169) without verifying multi-verse coverage due to absence of full DB dump.
• Logic is in place and should work as expected once start_verse_id and end_verse_id are populated in production/staging.