fix: include accountId in languages route cache key for multi-account segregation

[tmdeveloper007]

fix: include accountId in languages route cache key for multi-account segregation

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[github-actions]

GSSoC Label Checklist 🏷️

@Priyanshu-byte-coder — please apply the appropriate labels before merging:

Difficulty (pick one):

• level:beginner — 20 pts
• level:intermediate — 35 pts
• level:advanced — 55 pts
• level:critical — 80 pts

Quality (optional):

• quality:clean — ×1.2 multiplier
• quality:exceptional — ×1.5 multiplier

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• gssoc:approved — counts for points
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Type labels (type:*) are auto-detected from files and title. Review and adjust if needed.
Points formula: (difficulty × quality_multiplier) + type_bonus

[tmdeveloper007]

This pull request is fully up-to-date with the latest upstream merges, all review items are addressed, local tests are passing cleanly, and it is fully ready to be merged! 🚀

[Priyanshu-byte-coder]

Merge conflict: e2e/landing.spec.js conflicts because PR #841 was already merged. Please rebase against main. Also note: the PR title says 'include accountId in languages route cache key' but the actual diff contains a landing page e2e test and a githubId param validation — please update the PR title and description to match the actual changes.

[Priyanshu-byte-coder]

This PR has merge conflicts with main. Please rebase on current main to resolve and re-request review. All changes look good otherwise.

[tmdeveloper007]

Hi! This branch has been rebased and is ready to merge.