feat: add job models with Pydantic

tests/test_models.py

@@ -0,0 +1,31 @@
+from datetime import datetime
+
+from app.models import Job, JobStatus, CreateJobRequest, JobResponse
+
+
+def test_job_creation():
+    job = Job(command="-i input.mp4 output.mp4")
+
+    assert job.id.startswith("job_")
+    assert len(job.id) == 20  # job_ + 16 hex chars
+    assert job.status == JobStatus.QUEUED
+    assert job.command == "-i input.mp4 output.mp4"
+    assert isinstance(job.created_at, datetime)
+    assert job.started_at is None
+    assert job.completed_at is None
+    assert job.progress is None
+    assert job.output_files == []
+    assert job.error is None
+
+
+def test_create_job_request():
+    request = CreateJobRequest(command="-i test.mp4 out.mp4")
+    assert request.command == "-i test.mp4 out.mp4"
+
+
+def test_job_response_from_job():
+    job = Job(command="-i input.mp4 output.mp4")
+    response = JobResponse.model_validate(job.model_dump())
+
+    assert response.id == job.id
+    assert response.status == JobStatus.QUEUED