Support both /reel and /reels Instagram URLs

[TheUnrealZaka]

Summary

This PR fixes Instagram link detection to support both /reel/ and /reels/ URL formats across all components.

Problem

The bot only detected Instagram links with /reel/ (singular), but Instagram also uses /reels/ (plural) in some URLs:

• ✅ Detected: https://www.instagram.com/reel/code/
• ❌ Not detected: https://www.instagram.com/reels/code/

Solution

Updated the Instagram regex patterns from /reel/ to /reels?/

The s? makes the "s" optional, matching both reel and reels.

[Copilot]

Pull request overview

This PR extends Instagram link detection to support both /reel/ (singular) and /reels/ (plural) URL formats by updating regex patterns from /reel/ to /reels?/ across the codebase.

Key Changes:

• Updated regex patterns to use reels? (making the 's' optional) instead of separate patterns for /reel/ and /reels/
• Consolidated duplicate patterns in handler files into a single pattern
• Added documentation for the /instagram/reels/{shortcode} endpoint

Reviewed changes

Copilot reviewed 7 out of 7 changed files in this pull request and generated no comments.

Show a summary per file

File	Description
service/src/utils/fetch.ts	Updated parseInstagramUrl regex pattern to match both /reel/ and /reels/
service/src/src/utils/fetch.ts	Updated parseInstagramUrl regex pattern (duplicate location)
service/src/handlers/instagram.ts	Consolidated two separate patterns into one using reels?
service/src/src/handlers/instagram.ts	Consolidated two separate patterns (duplicate location)
service/README.md	Added /instagram/reels/{shortcode} to documented API endpoints
service/src/README.md	Added /instagram/reels/{shortcode} to documented API endpoints (duplicate location)
main.py	Updated Python regex pattern to support both URL formats

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