Wire the app, worker, and cleanup entry points onto Prisma Client

Task 4 rewrote src/db.js and src/jobs/jobRepository.js to use Prisma
instead of the hand-rolled mariadb pool. This updates every remaining
call site (app.js, server.js, worker.js, cleanup.js) and the 5 test
files that still referenced getPool/closePool/pool.query, so the app
and full test suite compile and run against Prisma Client.

Co-Authored-By: Claude Sonnet 5 <noreply@anthropic.com>

src/app.js

@@ -31,7 +31,7 @@ function registerAllConverters() {
   convertersRegistered = true;
 }
 
-export function createApp(config, pool) {
+export function createApp(config, prisma) {
   registerAllConverters();
 
   const app = express();
@@ -131,7 +131,7 @@ export function createApp(config, pool) {
       }
 
       const expiresAt = new Date(Date.now() + config.retentionHours * 3600 * 1000);
-      await createJob(pool, {
+      await createJob(prisma, {
         uuid,
         family: registryEntry.family,
         sourceFormat,
@@ -151,7 +151,7 @@ export function createApp(config, pool) {
   });
 
   app.get('/api/jobs/:id', async (req, res) => {
-    const job = await getJobByUuid(pool, req.params.id);
+    const job = await getJobByUuid(prisma, req.params.id);
     if (!job) {
       return res.status(404).json({ error: 'Job not found' });
     }
@@ -173,7 +173,7 @@ export function createApp(config, pool) {
   }
 
   app.get('/api/jobs/:id/download', async (req, res) => {
-    const job = await getJobByUuid(pool, req.params.id);
+    const job = await getJobByUuid(prisma, req.params.id);
     if (!job) {
       return res.status(404).json({ error: 'Job not found' });
     }