fix: infrastructure for prod-parity deployment

Added db schema migration script (scripts/migrate.js) for fresh deployments,
updated Dockerfile to include scripts directory, and fixed job-progress test
to include newly added retry fields after D3 foundation merge.

Co-Authored-By: Claude Haiku 4.5 <noreply@anthropic.com>

src/tests/job-progress.test.ts

@@ -15,6 +15,8 @@ function makeJob(overrides: Partial<Job> = {}): Job {
 		outputDir: null,
 		segmentsJson: null,
 		error: null,
+		retryCount: null,
+		nextRetryAt: null,
 		createdAt: new Date().toISOString(),
 		updatedAt: new Date().toISOString(),
 		...overrides