feat(TRUEREF-0022): complete iteration 0 — worker-thread indexing, parallel jobs, SSE progress

- Move IndexingPipeline.run() into Worker Threads via WorkerPool
- Add dedicated embedding worker thread with single model instance
- Add stage/stageDetail columns to indexing_jobs schema
- Create ProgressBroadcaster for SSE channel management
- Add SSE endpoints: GET /api/v1/jobs/:id/stream, GET /api/v1/jobs/stream
- Replace UI polling with EventSource on repo detail and admin pages
- Add concurrency settings UI and API endpoint
- Build worker entries separately via esbuild

src/routes/api/v1/api-contract.integration.test.ts

@@ -56,6 +56,7 @@ function createTestDb(): Database.Database {
 	const migration1 = readFileSync(join(migrationsFolder, '0001_quick_nighthawk.sql'), 'utf-8');
 	const migration2 = readFileSync(join(migrationsFolder, '0002_silky_stellaris.sql'), 'utf-8');
 	const migration3 = readFileSync(join(migrationsFolder, '0003_multiversion_config.sql'), 'utf-8');
+	const migration4 = readFileSync(join(migrationsFolder, '0004_complete_sentry.sql'), 'utf-8');
 
 	// Apply first migration
 	const statements0 = migration0
@@ -95,6 +96,15 @@ function createTestDb(): Database.Database {
 		client.exec(statement);
 	}
 
+	const statements4 = migration4
+		.split('--> statement-breakpoint')
+		.map((statement) => statement.trim())
+		.filter(Boolean);
+
+	for (const statement of statements4) {
+		client.exec(statement);
+	}
+
 	client.exec(readFileSync(ftsFile, 'utf-8'));
 
 	return client;