feat(matching): match by text instead of IDs to support duplicates

[pganesh-apphelix]

Description

• Replaced ID-based matching with content-based (text + HMAC) matching.
• Fixes incorrect matches when multiple terms share the same definition.
• Removes encrypted key mapping and related handler/API.
• Simplifies frontend by embedding matching data directly.
• Enables many-to-many matching and improves overall reliability.

Jira

• https://2u-internal.atlassian.net/browse/TNL2-550

Version

• 1.0.16

[Copilot]

Pull request overview

This PR updates the matching game implementation to support duplicate definitions by switching from ID-based pairing to text-derived matching (term carries a match token derived from its definition), while removing the old encrypted key-mapping flow and related handler.

Changes:

• Replace start_matching_game / encrypted mapping approach with per-card match tokens and embedded page data.
• Update matching frontend logic to validate matches using the embedded match tokens instead of server-provided index mappings.
• Remove corresponding tests/handler plumbing and bump package version to 1.0.16.

Reviewed changes

Copilot reviewed 7 out of 7 changed files in this pull request and generated 5 comments.

Show a summary per file

File	Description
games/handlers/matching.py	Generates per-page payload with match/hash fields and initializes the new JS entrypoint; removes mapping decryption handler.
games/static/html/matching.html	Embeds matching payload (pages_json) and updates DOM attributes for matching.
games/static/js/src/matching.js	Reworks client-side matching to compare definition hashes vs term match tokens; removes server start call and obfuscated decoder flow.
games/games.py	Removes the start_matching_game XBlock JSON handler.
tests/test_games.py	Removes handler test for start_matching_game; minor import cleanup.
tests/handlers/test_matching_handlers.py	Removes tests for the deleted key-mapping handler; minor loop refactor.
setup.py	Version bump to 1.0.16.

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