GET /v1/stars?github=user/repo
GET /v1/stars?gitlab=user/repo
GET /v1/stars?repo=01user/repo (01 = GitHub, 02 = GitLab)
/v1/stars?github=octocat/Hello-World
[
{ "x": "2011-01-26", "y": 0 },
{ "x": "2026-09-23", "y": 3822 }
]