fix(web,api): débloquer la boucle de chargement 'Inventaire en cours' (Recherche/Admin)

- web: gestion d'erreur et d'état vide sur SearchPage/AdminPage
- web: client API — traitement des réponses sans contenu/erreurs réseau
- api: jobs.service — éviter le statut de scan perpétuellement en cours
- tests: client.test.ts

Refs: #12 (QA non-GREEN faute d'exécution, pas d'échec réel)

apps/api/src/jobs/jobs.service.ts

@@ -1,12 +1,16 @@
-import { Injectable } from "@nestjs/common";
-import { desc, eq } from "drizzle-orm";
+import { Injectable, OnModuleInit } from "@nestjs/common";
+import { desc, eq, inArray } from "drizzle-orm";
 import { DatabaseService } from "../database/database.service.js";
 import { jobs } from "../database/schema.js";
 
 @Injectable()
-export class JobsService {
+export class JobsService implements OnModuleInit {
   constructor(private readonly database: DatabaseService) {}
 
+  onModuleInit(): void {
+    this.failInterruptedJobs();
+  }
+
   create(type: string, detail?: string) {
     const now = this.database.now();
     return this.database.db
@@ -43,4 +47,16 @@ export class JobsService {
   list(limit = 50) {
     return this.database.db.select().from(jobs).orderBy(desc(jobs.createdAt)).limit(limit).all();
   }
+
+  private failInterruptedJobs(): void {
+    this.database.db
+      .update(jobs)
+      .set({
+        status: "failed",
+        error: "Job interrupted before completion, most likely by API shutdown or restart",
+        updatedAt: this.database.now()
+      })
+      .where(inArray(jobs.status, ["queued", "running"]))
+      .run();
+  }
 }