可见度趋势

GET /projects/{project_id}/visibility

{
  "success": true,
  "data": {
    "dates": ["2026-02-28", "2026-03-01", "2026-03-02", "2026-03-03"],
    "period": "2026-02-28 to 2026-03-03",
    "series": [
      {
        "competitor_id": "00000000-0000-0000-0000-000000000000",
        "name": "Acme Corp",
        "website": "https://acme.com",
        "icon_url": "https://logo.clearbit.com/acme.com",
        "is_own_brand": true,
        "visibility": [82.5, 85.0, 83.2, 86.1],
        "sentiment": [70.0, 72.0, 71.5, 73.0],
        "position": [1.8, 1.6, 1.9, 1.5]
      },
      {
        "competitor_id": "c1d2e3f4-...",
        "name": "Competitor A",
        "website": "https://competitor-a.com",
        "icon_url": "https://logo.clearbit.com/competitor-a.com",
        "is_own_brand": false,
        "visibility": [60.0, 62.5, null, 65.0],
        "sentiment": [55.0, 58.0, null, 60.0],
        "position": [3.2, 3.0, null, 2.8]
      }
    ]
  }
}