fix: update test fixtures for SQLite storage migration

All store tests were passing file paths instead of Database objects
after the JSON-to-SQLite migration. Updated fixtures to create temp
Database instances, rewrote backup e2e tests for binary .db format,
and fixed config tests for the simplified StorageConfig.

server/tests/storage/test_automation_store.py

@@ -18,8 +18,8 @@ from wled_controller.storage.automation_store import AutomationStore
 
 
 @pytest.fixture
-def store(tmp_path) -> AutomationStore:
-    return AutomationStore(str(tmp_path / "automations.json"))
+def store(tmp_db) -> AutomationStore:
+    return AutomationStore(tmp_db)
 
 
 # ---------------------------------------------------------------------------
@@ -240,16 +240,18 @@ class TestAutomationNameUniqueness:
 
 class TestAutomationPersistence:
     def test_persist_and_reload(self, tmp_path):
-        path = str(tmp_path / "auto_persist.json")
-        s1 = AutomationStore(path)
+        from wled_controller.storage.database import Database
+        db = Database(tmp_path / "auto_persist.db")
+        s1 = AutomationStore(db)
         a = s1.create_automation(
             name="Persist",
             conditions=[WebhookCondition(token="t1")],
         )
         aid = a.id
 
-        s2 = AutomationStore(path)
+        s2 = AutomationStore(db)
         loaded = s2.get_automation(aid)
         assert loaded.name == "Persist"
         assert len(loaded.conditions) == 1
         assert isinstance(loaded.conditions[0], WebhookCondition)
+        db.close()