feat(benchmark): scaffold paperless_benchmark app

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

.gitignore

@@ -115,3 +115,6 @@ celerybeat-schedule*
 
 # Git worktree local folder
 .worktrees
+
+# Benchmark tooling output (local only, never committed)
+/benchmark_results/

src/paperless/settings/__init__.py

@@ -150,6 +150,7 @@ INSTALLED_APPS = [
     "drf_spectacular",
     "drf_spectacular_sidecar",
     "treenode",
+    "paperless_benchmark.apps.PaperlessBenchmarkConfig",
     *env_apps,
 ]
 

src/paperless_benchmark/apps.py

@@ -0,0 +1,8 @@
+from django.apps import AppConfig
+from django.utils.translation import gettext_lazy as _
+
+
+class PaperlessBenchmarkConfig(AppConfig):
+    name = "paperless_benchmark"
+
+    verbose_name = _("Paperless benchmark")