fix: v0.3.3 — delete_container params (error 114) + delete_project orphan guard

Bug 1 — delete_container (DSM error 114):
SYNO.Docker.Container/delete requires three parameters: name
(JSON-encoded), force=false, and preserve_profile=false. Previously
only a bare `name` string was sent, causing DSM to reject the call
with error 114. Added the two missing fields and JSON-encode name to
match the DSM convention. The connector-side running-container guard
is unchanged; force stays hard-coded to false.

Bug 2 — delete_project orphan containers:
Production test revealed that DSM does NOT reject Project/delete on a
running project — it silently removes the registration and leaves the
containers running without any project context. The previous
implementation tried to handle this via a caught SynologyError that
never actually fires. Fix: check the project status from _find_project
connector-side before issuing any DSM call; if RUNNING, return an
error pointing at stop_project. The delete request is never sent for
a running project.

The corresponding unit test (test_delete_project_running_returns_stop_hint)
was a false positive — it mocked a DSM rejection that real DSM never
produces. Replaced with test_delete_project_running_blocked_connector_side
which asserts that client.request("delete") is never called when the
project is RUNNING.

Co-Authored-By: Claude Opus 4.7 <noreply@anthropic.com>

src/mcp_synology_container/modules/containers.py

@@ -2,6 +2,7 @@
 
 from __future__ import annotations
 
+import json
 import logging
 import re
 from typing import TYPE_CHECKING, Any
@@ -319,7 +320,11 @@ def register_containers(mcp: FastMCP, config: AppConfig, client: DsmClient) -> N
             await client.request(
                 "SYNO.Docker.Container",
                 "delete",
-                params={"name": resolved_name},
+                params={
+                    "name": json.dumps(resolved_name),
+                    "force": "false",
+                    "preserve_profile": "false",
+                },
             )
             return f"Deleted container '{display_name}'."
         except Exception as e: