refactor: rename backend/frontend dirs and remove NovelWriter submodule

- Rename qwen3-tts-backend → canto-backend
- Rename qwen3-tts-frontend → canto-frontend
- Remove NovelWriter embedded repo

Co-Authored-By: Claude Sonnet 4.6 <noreply@anthropic.com>

canto-backend/indextts/utils/checkpoint.py

@@ -0,0 +1,34 @@
+# Copyright (c) 2020 Mobvoi Inc. (authors: Binbin Zhang)
+#
+# Licensed under the Apache License, Version 2.0 (the "License");
+# you may not use this file except in compliance with the License.
+# You may obtain a copy of the License at
+#
+#     http://www.apache.org/licenses/LICENSE-2.0
+#
+# Unless required by applicable law or agreed to in writing, software
+# distributed under the License is distributed on an "AS IS" BASIS,
+# WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+# See the License for the specific language governing permissions and
+# limitations under the License.
+
+import datetime
+import logging
+import os
+import re
+from collections import OrderedDict
+
+import torch
+import yaml
+
+
+def load_checkpoint(model: torch.nn.Module, model_pth: str) -> dict:
+    checkpoint = torch.load(model_pth, map_location='cpu')
+    checkpoint = checkpoint['model'] if 'model' in checkpoint else checkpoint
+    model.load_state_dict(checkpoint, strict=True)
+    info_path = re.sub('.pth$', '.yaml', model_pth)
+    configs = {}
+    if os.path.exists(info_path):
+        with open(info_path, 'r') as fin:
+            configs = yaml.load(fin, Loader=yaml.FullLoader)
+    return configs