v3.9.1 - Facebook Reels, Events, and Comments Sub-Source Routing

Facebook Sub-Source Granular Routing (v3.9.1)

• Allow Facebook Reels Traffic: Control visitors arriving from Facebook Reels videos, watch feeds (/reel/, /reels/, fb.watch, fb_reel).
• Allow Facebook Events Traffic: Control visitors arriving from Facebook Events pages and discussions (/events/, eid, event_id, fb_event).
• Allow Facebook Comments Traffic: Control visitors arriving from Facebook post comment links, replies, and discussion threads (comment_id, reply_comment_id, /comments/, fbc).
• Added corresponding UI toggles in Tab 3 (Cloaking & Fallback) with automatic persistence.
• Verified and synchronized across main and master branches.