Chore: share one base class for the method-mapped permission classes

ViewDocumentsPermissions, TrashPermissions, PaperlessNotePermissions and
AcknowledgeTasksPermissions each repeated the same has_permission body and
disagreed on HTTP methods missing from their perms_map.

GlobalPermissionsByMethod now holds that logic once. HEAD is checked
against the GET entry and a method missing from the map is denied. The
task acknowledge map gains OPTIONS, now requiring change_paperlesstask
like POST instead of being open to any authenticated user. The global
statistics and system status checks also share their active and
authenticated preamble.

src/documents/tests/test_api_documents.py

@@ -3653,6 +3653,34 @@ class TestDocumentApi(DirectoriesMixin, ConsumeTaskMixin, APITestCase):
         )
         self.assertEqual(response.status_code, status.HTTP_200_OK)
 
+    def test_notes_head_and_unsupported_methods(self) -> None:
+        """
+        GIVEN:
+            - A user allowed to view notes on their own document
+        WHEN:
+            - The notes endpoint is requested with HEAD, PUT and PATCH
+        THEN:
+            - HEAD is allowed like GET
+            - PUT and PATCH are rejected with 403 rather than a server error
+        """
+        user = UserFactory()
+        grant_global(user, "view_note", "view_document")
+        doc = DocumentFactory(owner=user)
+        self.client.force_authenticate(user)
+
+        self.assertEqual(
+            self.client.head(f"/api/documents/{doc.pk}/notes/").status_code,
+            status.HTTP_200_OK,
+        )
+        self.assertEqual(
+            self.client.put(f"/api/documents/{doc.pk}/notes/").status_code,
+            status.HTTP_403_FORBIDDEN,
+        )
+        self.assertEqual(
+            self.client.patch(f"/api/documents/{doc.pk}/notes/").status_code,
+            status.HTTP_403_FORBIDDEN,
+        )
+
     def test_delete_note(self) -> None:
         """
         GIVEN:

src/documents/tests/test_api_search.py

@@ -1001,6 +1001,21 @@ class TestDocumentSearchApi(DirectoriesMixin, APITestCase):
         self.assertEqual(response.status_code, status.HTTP_200_OK)
         self.assertEqual(len(response.data), 10)
 
+    def test_search_autocomplete_head_requires_view_document(self) -> None:
+        """
+        GIVEN:
+            - A user without the global view document permission
+        WHEN:
+            - A HEAD request is made for autocomplete
+        THEN:
+            - It is rejected like the equivalent GET request
+        """
+        self.client.force_authenticate(user=UserFactory())
+
+        response = self.client.head("/api/search/autocomplete/?term=test")
+
+        self.assertEqual(response.status_code, status.HTTP_403_FORBIDDEN)
+
     def test_search_autocomplete_respect_permissions(self) -> None:
         """
         GIVEN: