diff --git a/Dockerfile.api b/Dockerfile.api
index 21a2667..73911ec 100644
--- a/Dockerfile.api
+++ b/Dockerfile.api
@@ -43,6 +43,9 @@ RUN --mount=type=cache,id=pnpm,target=/root/.local/share/pnpm/store \
 FROM deps AS build
 COPY packages/shared ./packages/shared
 COPY apps/api ./apps/api
+# Inclus les PDFs de démo pour le command `seed:demo` (lancé manuellement
+# en prod via `kubectl exec`). 27 fichiers, ~80KB total — négligeable.
+COPY assets ./assets
 RUN cd apps/api && pnpm exec tsx ace.js build --ignore-ts-errors
 
 # Prune devDeps (les workspace symlinks restent).
diff --git a/apps/api/database/factories.ts b/apps/api/database/factories.ts
index 90ae5aa..7a609fd 100644
--- a/apps/api/database/factories.ts
+++ b/apps/api/database/factories.ts
@@ -414,12 +414,15 @@ async function seedSyntheticActionable(
 // ---------------------------------------------------------------------------
 
 /**
- * Localise le dossier `assets/test-invoices` à la racine du repo. Le command
- * tourne depuis `apps/api/`, donc on remonte de 2 niveaux.
+ * Localise le dossier `assets/test-invoices`. La résolution couvre 3 contextes :
+ *   - dev local : cwd = `apps/api/`         → `../../assets/test-invoices`
+ *   - prod (init) : cwd = `/app/apps/api`   → `../../assets/test-invoices`
+ *   - prod (build) : cwd = `/app/apps/api/build` → `../../../assets/test-invoices`
  */
 function resolveTestInvoicesDir(): string | null {
   const candidates = [
     join(process.cwd(), '..', '..', 'assets', 'test-invoices'),
+    join(process.cwd(), '..', '..', '..', 'assets', 'test-invoices'),
     join(process.cwd(), 'assets', 'test-invoices'),
   ]
   for (const c of candidates) {