feat: add 5 notification mutations + comprehensive refactors from PR review

New notification actions (archive_many, create_unique, unarchive_many,
unarchive_all, recalculate) bring unraid_notifications to 14 actions.

Also includes continuation of CodeRabbit/PR review fixes:
- Remove redundant try-except in virtualization.py (silent failure fix)
- Add QueryCache protocol with get/put/invalidate_all to core/client.py
- Refactor subscriptions (manager, diagnostics, resources, utils)
- Update config (logging, settings) for improved structure
- Expand test coverage: http_layer, safety guards, schema validation
- Minor cleanups: array, docker, health, keys tools

Co-authored-by: Claude <noreply@anthropic.com>

tests/schema/test_query_validation.py

@@ -153,10 +153,25 @@ class TestInfoQueries:
         from unraid_mcp.tools.info import QUERIES
 
         expected_actions = {
-            "overview", "array", "network", "registration", "connect",
-            "variables", "metrics", "services", "display", "config",
-            "online", "owner", "settings", "server", "servers",
-            "flash", "ups_devices", "ups_device", "ups_config",
+            "overview",
+            "array",
+            "network",
+            "registration",
+            "connect",
+            "variables",
+            "metrics",
+            "services",
+            "display",
+            "config",
+            "online",
+            "owner",
+            "settings",
+            "server",
+            "servers",
+            "flash",
+            "ups_devices",
+            "ups_device",
+            "ups_config",
         }
         assert set(QUERIES.keys()) == expected_actions
 
@@ -314,8 +329,13 @@ class TestDockerQueries:
         from unraid_mcp.tools.docker import QUERIES
 
         expected = {
-            "list", "details", "logs", "networks",
-            "network_details", "port_conflicts", "check_updates",
+            "list",
+            "details",
+            "logs",
+            "networks",
+            "network_details",
+            "port_conflicts",
+            "check_updates",
         }
         assert set(QUERIES.keys()) == expected
 
@@ -520,7 +540,19 @@ class TestNotificationMutations:
     def test_all_notification_mutations_covered(self, schema: GraphQLSchema) -> None:
         from unraid_mcp.tools.notifications import MUTATIONS
 
-        expected = {"create", "archive", "unread", "delete", "delete_archived", "archive_all"}
+        expected = {
+            "create",
+            "archive",
+            "unread",
+            "delete",
+            "delete_archived",
+            "archive_all",
+            "archive_many",
+            "create_unique",
+            "unarchive_many",
+            "unarchive_all",
+            "recalculate",
+        }
         assert set(MUTATIONS.keys()) == expected
 
 
@@ -713,8 +745,7 @@ class TestSchemaCompleteness:
                     failures.append(f"{tool_name}/MUTATIONS/{action}: {errors[0]}")
 
         assert not failures, (
-            f"{len(failures)} of {total} operations failed validation:\n"
-            + "\n".join(failures)
+            f"{len(failures)} of {total} operations failed validation:\n" + "\n".join(failures)
         )
 
     def test_schema_has_query_type(self, schema: GraphQLSchema) -> None: