feat: odometer baseline syncs to server — push on save, pull on sync, +/api/device-config/push endpoint

server/app.py

@@ -781,6 +781,22 @@ def api_device_config_get():
     return jsonify(config)
 
 
+@app.post("/api/device-config/push")
+@require_device_auth
+def api_device_config_push():
+    """Update device configuration from the Pi (device-authenticated).
+    
+    Pi pushes local config changes to server. Accepts a partial update:
+    any of owner_name, car_model, device_name, avatar_path, odometer_baseline.
+    """
+    body = request.get_json(silent=True) or {}
+    success, errors = device_config.update_device_config(g.device_id, body)
+    if not success:
+        return jsonify(error="Invalid device config.", fields=errors), 400
+    config = device_config.get_device_config(g.device_id)
+    return jsonify(config)
+
+
 @app.post("/api/v1/device-config/ack")
 @require_device_auth
 def api_device_config_ack():