fix: disabled STT also covers live finish; clarify model cache location

docs/content/Deploying/Development-Environment.mdx

@@ -78,7 +78,7 @@ To run the DocsGPT backend locally, you'll need to set up a Python environment a
 
 3.  **Embedding Model (no action needed):**
 
-    The embedding model is downloaded automatically the first time you ingest a document, and cached under `models/` in the repository root for subsequent runs. Set `EMBEDDINGS_CACHE_DIR` to use another directory.
+    The embedding model is downloaded automatically the first time you ingest a document, and cached for subsequent runs under `models/` in the data home: the repository root, unless `DOCSGPT_HOME` points elsewhere. Set `EMBEDDINGS_CACHE_DIR` to use another directory.
 
     For an offline or air-gapped machine, fetch it ahead of time instead:
 

docsgpt/api/user/attachments/routes.py

@@ -688,6 +688,8 @@ class LiveSpeechToTextFinish(Resource):
                 jsonify({"success": False, "message": "Authentication required"}),
                 401,
             )
+        if not STTCreator.is_enabled(settings.STT_PROVIDER):
+            return _feature_disabled(_STT_DISABLED_MESSAGE)
 
         redis_client = _require_live_stt_redis()
         if hasattr(redis_client, "status_code"):

tests/api/user/attachments/test_routes.py

@@ -1929,6 +1929,21 @@ class TestSpeechToTextDisabled:
             assert _get_response_json(response) == self.DISABLED
         mock_create_stt.assert_not_called()
 
+    def test_live_stt_finish_returns_404_without_touching_redis(self, flask_app):
+        from docsgpt.api.user.attachments import routes
+
+        app = Flask(__name__)
+        with patch.object(routes.settings, "STT_PROVIDER", "none"), patch.object(
+            routes, "_require_live_stt_redis"
+        ) as require_redis, app.test_request_context(
+            "/api/stt/live/finish", method="POST", json={"session_id": "abc"}
+        ):
+            request.decoded_token = {"sub": "test_user"}
+            response = routes.LiveSpeechToTextFinish().post()
+            assert _get_response_status(response) == 404
+            assert _get_response_json(response) == self.DISABLED
+        require_redis.assert_not_called()
+
 
 # =====================================================================
 # Coverage gap tests  (lines 136, 256, 330, 337, 443, 457, 560, 590)