Fix launcher overlay startup gating and socket alignment

- only start overlay from launcher when --start is passed or plugin auto_start is enabled

- read socket_path from mpv script-opts/subminer.conf and use it for mpv/overlay/subtitle IPC

- only stop overlay on launcher cleanup when launcher actually started it

- preserve --start semantics for second-instance command+action flows so MPV reconnect happens before toggles

src/core/services/cli-command-service.test.ts

@@ -255,7 +255,7 @@ test("handleCliCommandService still runs non-start actions on second-instance",
     deps,
   );
   assert.ok(calls.includes("toggleVisibleOverlay"));
-  assert.equal(calls.some((value) => value === "connectMpvClient"), false);
+  assert.equal(calls.some((value) => value === "connectMpvClient"), true);
 });
 
 test("handleCliCommandService handles visibility and utility command dispatches", () => {