Fix create_network + delete_network: POST with DevTools-confirmed format

create_network:
  - Switch from GET request() to post_request()
  - name, subnet, gateway, iprange → json.dumps(value) per DSM convention
  - disable_masquerade=json.dumps(False) added as required fixed param

delete_network:
  - Switch from GET request() to post_request() with method "remove"
    (was "delete" — wrong method name)
  - Send full network object from list response as
    networks=json.dumps([{...}]) including all DSM fields plus _key=id
    (ipv6_gateway, ipv6_subnet, ipv6_iprange, disable_masquerade with
    safe defaults for fields absent from the list response)

Tests updated: mock post_request, assert correct method/params structure.

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

src/mcp_synology_container/modules/networks.py

@@ -89,20 +89,22 @@ def register_networks(mcp: FastMCP, config: AppConfig, client: DsmClient) -> Non
                 + f"\n\nCall create_network(name={name!r}, confirmed=True) to confirm."
             )
 
+        # DevTools-confirmed POST format: all string/bool params as json.dumps.
         params: dict[str, Any] = {
-            "name": name,
+            "name": json.dumps(name),
             "driver": driver,
             "enable_ipv6": json.dumps(enable_ipv6),
+            "disable_masquerade": json.dumps(False),
         }
         if subnet is not None:
-            params["subnet"] = subnet
+            params["subnet"] = json.dumps(subnet)
         if gateway is not None:
-            params["gateway"] = gateway
+            params["gateway"] = json.dumps(gateway)
         if ip_range is not None:
-            params["iprange"] = ip_range
+            params["iprange"] = json.dumps(ip_range)
 
         try:
-            result = await client.request("SYNO.Docker.Network", "create", params=params)
+            result = await client.post_request("SYNO.Docker.Network", "create", params=params)
         except Exception as e:
             return f"Error creating network '{name}': {e}"
 
@@ -147,8 +149,32 @@ def register_networks(mcp: FastMCP, config: AppConfig, client: DsmClient) -> Non
                 f"Call delete_network(name={name!r}, confirmed=True) to confirm."
             )
 
+        # DevTools-confirmed POST format: method="remove", full network object
+        # as a JSON array in the "networks" parameter.  The object must include
+        # all fields from the list response plus "_key" set to the network ID.
+        net_id = target.get("id", "")
+        network_obj: dict[str, Any] = {
+            "containers": target.get("containers") or [],
+            "driver": target.get("driver", ""),
+            "enable_ipv6": target.get("enable_ipv6", False),
+            "ipv6_gateway": target.get("ipv6_gateway", ""),
+            "ipv6_subnet": target.get("ipv6_subnet", ""),
+            "ipv6_iprange": target.get("ipv6_iprange", ""),
+            "gateway": target.get("gateway", ""),
+            "id": net_id,
+            "iprange": target.get("iprange", ""),
+            "name": name,
+            "subnet": target.get("subnet", ""),
+            "disable_masquerade": target.get("disable_masquerade", False),
+            "_key": net_id,
+        }
+
         try:
-            await client.request("SYNO.Docker.Network", "delete", params={"name": name})
+            await client.post_request(
+                "SYNO.Docker.Network",
+                "remove",
+                params={"networks": json.dumps([network_obj])},
+            )
         except Exception as e:
             return f"Error deleting network '{name}': {e}"