Exclude reproducible framework code from Mautic/Nextcloud PVC backups

Mautic (node_modules/, vendor/) and Nextcloud (apps/, core/, dist/,
3rdparty/, lib/) share one PVC mount with their real user data, and were
backing up ~700MB-1GB of app/vendor code that's identical to what ships in
the image, alongside the actual user data. Excluded both via tar --exclude
in the PVC capture step: Mautic backup drops from ~185MB to ~90MB
compressed, Nextcloud from ~379MB to ~107MB.

Verified the "the image lays these down fresh on start" assumption before
relying on it — it does NOT hold for either app as a naive exclude:
  - Mautic's entrypoint has no logic at all to reconstruct node_modules/
    vendor if missing (confirmed empty by reading /entrypoint.sh).
  - Nextcloud's entrypoint only rsyncs from /usr/src/nextcloud when
    image_version > installed_version (read from version.php). Since
    version.php itself isn't excluded, a restored version.php already
    matches the running image's version, so that path never fires.

So restore-k8s-apps.sh now explicitly re-seeds these dirs from the app's
own live image (both images bake them in at /var/www/html independently of
any volume mount) via a loader pod with the PVC mounted at a different
path, after the normal PVC-data restore and before scaling the app back
up. If that re-seed fails, the app is deliberately left at 0 replicas
instead of coming back up broken (missing vendor/autoload.php is a hard
crash, not a degraded state) — found this the hard way in testing when a
90s wait timed out mid image-pull and scale-up proceeded anyway with
vendor/ missing; fixed by gating scale-up on the re-seed outcome and
raising the timeout to 240s with imagePullPolicy: IfNotPresent (the image
is already on-node, pulled off the live Deployment spec).

Verified end-to-end: real backup + restore of Mautic on the live cluster,
confirming size drop, vendor/autoload.php present post-restore, app
serving 200s, and all 433,681 leads intact via the DB restore.

Also found and left unfixed (pre-existing, unrelated): secret.yaml apply
during restore can hit a resourceVersion conflict from kubectl apply
against a captured manifest — the mautic-secrets apply failed on this
restore test with a benign "object has been modified" error since the
secret already existed with correct values; app was unaffected. Separate
bug from this change, flagging for later.

backup/restore-k8s-apps.sh

@@ -103,6 +103,24 @@ declare -A DB_USER_KEY=( [n8n]=DB_POSTGRESDB_USER [odoo]=POSTGRES_USER [mautic]=
 declare -A DB_PASS_KEY=( [n8n]=DB_POSTGRESDB_PASSWORD [odoo]=POSTGRES_PASSWORD [mautic]=MYSQL_ROOT_PASSWORD [nextcloud]=POSTGRES_PASSWORD [frappe]=MARIADB_ROOT_PASSWORD )
 declare -A DOMAIN=(      [n8n]="n8nwf.nav.ovh" [odoo]="odooo.nav.ovh" [mautic]="mautics.nav.ovh" [nextcloud]="next.cloud.nav.ovh" [frappe]="erpnext.navitrends.ovh" )
 
+# Dirs backup-k8s-apps.sh excludes from pvc-data.tar.gz for these two apps
+# (reproducible framework/vendor code, not user data — see matching
+# TAR_EXCLUDES table + comment there). They must be re-seeded here from the
+# app's own live image, NOT reconstructed by the container entrypoint:
+#   - Mautic's image has no logic at all to repopulate node_modules/vendor
+#     if missing — confirmed empty by reading /entrypoint.sh.
+#   - Nextcloud's entrypoint only rsyncs from /usr/src/nextcloud when it
+#     detects image_version > installed_version (via version.php). Since
+#     version.php itself is NOT excluded (kept, "everything else"), a
+#     restored version.php already matches the running image's version, so
+#     that rsync path never fires — relying on it would silently leave
+#     apps/core/dist/3rdparty/lib missing after restore.
+# Both images bake these dirs into their own filesystem layer independent
+# of any volume mount, so cp'ing from a loader pod running the same image
+# (PVC mounted elsewhere, so it doesn't shadow the image's own copy) is
+# reliable regardless of either app's startup logic.
+declare -A RECONSTRUCT_DIRS=( [mautic]="node_modules vendor" [nextcloud]="apps core dist 3rdparty lib" )
+
 ALL_APPS="n8n odoo mautic nextcloud frappe"
 LOADER_IMAGE="alpine:3.20"
 
@@ -216,9 +234,67 @@ for app in $ALL_APPS; do
         echo "   ⏭️  No pvc-data.tar.gz in backup — skipping PVC restore"
     fi
 
+    # ---- 3b. Re-seed reproducible dirs excluded from backup (see
+    #          RECONSTRUCT_DIRS comment above) from the app's own live image,
+    #          never from the backup archive itself ----
+    reseed_failed=false
+    if [ -n "${RECONSTRUCT_DIRS[$app]:-}" ] && kubectl get pvc "$pvc_name" -n "$ns" &>/dev/null; then
+        app_image=$(kubectl get deployment "$app_deploy" -n "$ns" -o jsonpath='{.spec.template.spec.containers[0].image}' 2>/dev/null)
+        if [ -n "$app_image" ]; then
+            seed_loader="${app}-reseed-loader"
+            echo -n "   🧩 Re-seeding [${RECONSTRUCT_DIRS[$app]}] from $app_image ... "
+            # imagePullPolicy IfNotPresent: $app_image is read straight off the
+            # currently-running Deployment, so it's already on this node —
+            # forcing a re-pull (the ":latest"/floating-tag default) just adds
+            # a slow, needless network fetch during every restore.
+            kubectl run "$seed_loader" -n "$ns" --image="$app_image" --restart=Never \
+                --overrides="{\"spec\":{\"containers\":[{\"name\":\"loader\",\"image\":\"${app_image}\",\"imagePullPolicy\":\"IfNotPresent\",\"command\":[\"sleep\",\"3600\"],\"volumeMounts\":[{\"name\":\"data\",\"mountPath\":\"/restore\"}]}],\"volumes\":[{\"name\":\"data\",\"persistentVolumeClaim\":{\"claimName\":\"${pvc_name}\"}}]}}" \
+                &>/dev/null
+            # 240s, not 60/90s like the alpine loader above: this pulls the
+            # full app image (600MB+ for mautic/nextcloud) if it isn't cached
+            # on this node yet — a 90s timeout was observed to fire mid-pull
+            # in testing, silently leaving the app pod without its
+            # reconstructed dirs after being scaled back up.
+            if kubectl wait --for=condition=Ready "pod/$seed_loader" -n "$ns" --timeout=240s &>/dev/null; then
+                seed_ok=true
+                : > "$APP_DIR/reseed.err"
+                for _seed_dir in ${RECONSTRUCT_DIRS[$app]}; do
+                    kubectl exec -n "$ns" "$seed_loader" -- sh -c "rm -rf '/restore/$_seed_dir' && cp -a '${pvc_path}/${_seed_dir}' '/restore/$_seed_dir'" \
+                        >>"$APP_DIR/reseed.err" 2>&1 || seed_ok=false
+                done
+                if $seed_ok; then
+                    echo "✅"
+                    rm -f "$APP_DIR/reseed.err"
+                else
+                    echo "⚠️  FAILED (see $APP_DIR/reseed.err)"
+                    app_ok=false
+                    reseed_failed=true
+                fi
+            else
+                echo "⚠️  loader pod not ready"
+                app_ok=false
+                reseed_failed=true
+            fi
+            kubectl delete pod "$seed_loader" -n "$ns" --wait=false &>/dev/null
+        else
+            echo "   ⚠️  Could not determine $app image — skipping re-seed of [${RECONSTRUCT_DIRS[$app]}]"
+            app_ok=false
+            reseed_failed=true
+        fi
+    fi
+
     # ---- 4. Scale app back up ----
-    echo -n "   ▶️  Scaling $app_deploy back to $prior_replicas ... "
-    kubectl scale deployment "$app_deploy" -n "$ns" --replicas="$prior_replicas" &>/dev/null && echo "✅" || echo "⚠️  FAILED"
+    # Never bring the app back with replicas>0 if a required re-seed (3b)
+    # failed — for Mautic/Nextcloud that means booting with vendor/ or
+    # core/lib missing, which is a hard crash/broken-app state, not a
+    # degraded one. Left at 0 so the operator fixes it and scales up
+    # manually rather than the restore silently serving a broken app.
+    if $reseed_failed; then
+        echo "   ⛔ Skipping scale-up — required re-seed failed (app left at 0 replicas, see above)"
+    else
+        echo -n "   ▶️  Scaling $app_deploy back to $prior_replicas ... "
+        kubectl scale deployment "$app_deploy" -n "$ns" --replicas="$prior_replicas" &>/dev/null && echo "✅" || echo "⚠️  FAILED"
+    fi
 
     # ---- 5. DB restore (SQL-level, never raw datadir copy) ----
     if [ -f "$APP_DIR/db-dump.sql.gz" ]; then