feat(music-lab): video_projects·revenue_records DB 마이그레이션 + CRUD

- init_db()에 video_projects, revenue_records 테이블 추가 (CREATE IF NOT EXISTS)
- video_projects CRUD: create/get/get_all/update_status/delete + get_track_by_id
- revenue_records CRUD: create/get_all/update/delete/get_revenue_dashboard (RPM 자동 계산)
- TDD: tests/test_db_video.py 5개 테스트 모두 PASSED
- pytest.ini 추가 (pythonpath=. 설정)

Co-Authored-By: Claude Sonnet 4.6 <noreply@anthropic.com>

music-lab/tests/conftest.py

@@ -0,0 +1,7 @@
+import pytest
+
+@pytest.fixture
+def tmp_db(tmp_path, monkeypatch):
+    db_path = str(tmp_path / "test_music.db")
+    monkeypatch.setattr("app.db.DB_PATH", db_path)
+    return db_path

music-lab/tests/test_db_video.py

@@ -0,0 +1,72 @@
+def test_create_and_get_video_project(tmp_db):
+    from app.db import init_db, create_video_project, get_video_project
+    init_db()
+    proj = create_video_project({"track_id": 1, "format": "visualizer", "target_countries": ["BR", "ID"]})
+    assert proj["id"] == 1
+    assert proj["format"] == "visualizer"
+    assert proj["status"] == "pending"
+    assert "BR" in proj["target_countries"]
+
+    fetched = get_video_project(1)
+    assert fetched["id"] == 1
+    assert fetched["track_id"] == 1
+
+
+def test_update_video_project_status(tmp_db):
+    from app.db import init_db, create_video_project, update_video_project_status, get_video_project
+    init_db()
+    create_video_project({"track_id": 2, "format": "slideshow"})
+    update_video_project_status(
+        1, "done",
+        output_path="/data/videos/1/output.mp4",
+        output_url="/media/videos/1/output.mp4",
+        thumbnail_path="/data/videos/1/thumbnail.jpg",
+        yt_title="Chill Beats Brazil",
+        yt_description="relaxing lofi",
+        yt_tags=["lofi", "chill"],
+    )
+    proj = get_video_project(1)
+    assert proj["status"] == "done"
+    assert proj["yt_title"] == "Chill Beats Brazil"
+    assert "lofi" in proj["yt_tags"]
+    assert proj["completed_at"] is not None
+
+
+def test_delete_video_project(tmp_db):
+    from app.db import init_db, create_video_project, delete_video_project, get_video_project
+    init_db()
+    create_video_project({"track_id": 1, "format": "visualizer"})
+    assert delete_video_project(1) is True
+    assert get_video_project(1) is None
+    assert delete_video_project(99) is False
+
+
+def test_create_revenue_record(tmp_db):
+    from app.db import init_db, create_revenue_record, get_all_revenue_records
+    import pytest
+    init_db()
+    rec = create_revenue_record({
+        "yt_video_id": "abc123",
+        "record_month": "2026-04",
+        "views": 10000,
+        "watch_hours": 500.0,
+        "revenue_usd": 25.0,
+        "country": "BR",
+    })
+    assert rec["id"] == 1
+    assert rec["rpm_usd"] == pytest.approx(2.5)
+
+    records = get_all_revenue_records(yt_video_id="abc123")
+    assert len(records) == 1
+
+
+def test_revenue_dashboard(tmp_db):
+    from app.db import init_db, create_revenue_record, get_revenue_dashboard
+    import pytest
+    init_db()
+    create_revenue_record({"yt_video_id": "v1", "record_month": "2026-04", "views": 5000, "revenue_usd": 10.0})
+    create_revenue_record({"yt_video_id": "v2", "record_month": "2026-04", "views": 5000, "revenue_usd": 15.0})
+    dash = get_revenue_dashboard()
+    assert dash["total_revenue_usd"] == pytest.approx(25.0)
+    assert dash["total_views"] == 10000
+    assert len(dash["by_month"]) == 1