Fix LeetCode detection via GraphQL API

[siddharthaasal]

Problem

LeetCode is currently reported as not found for every username. Two things changed on LeetCode's side:

1. Profiles moved from https://leetcode.com/{} to https://leetcode.com/u/{}/.
2. Direct profile requests now return HTTP 403 for everyone (bot protection), so status_code detection can never succeed.

Fix

Switch LeetCode to its public GraphQL API (matchedUser query) and detect the "That user does not exist." error message returned for missing users. This mirrors the existing Anilist entry, which already uses a POST + GraphQL urlProbe + request_payload pattern. The display url is also updated to the new /u/{}/ path.

"LeetCode": {
  "errorMsg": "That user does not exist.",
  "errorType": "message",
  "request_method": "POST",
  "request_payload": {
    "query": "query getUserProfile($username: String!) { matchedUser(username: $username) { username } }",
    "variables": { "username": "{}" }
  },
  "url": "https://leetcode.com/u/{}/",
  "urlMain": "https://leetcode.com/",
  "urlProbe": "https://leetcode.com/graphql",
  "username_claimed": "blue"
}

Testing

• test_manifest.py schema validation — passes
• test_validate_targets.py false-negative (LeetCode) — passes (known user → Claimed)
• test_validate_targets.py false-positive (LeetCode) — passes (random users → Available)

Verified manually:

• sherlock siddharthaasal --site LeetCode → found
• random/nonexistent username → not found

[github-actions]

Automatic validation of changes

Target	F+ Check	F- Check
LeetCode	✔️   Pass	✔️   Pass

[siddharthaasal]

hi, any updates on this? is there anything on my end that I can offer help with?