refactor(core): normalize core service naming

Standardize core service module and export names to reduce naming ambiguity and make imports predictable across runtime, tests, scripts, and docs.

src/main/ipc-mpv-command.ts

@@ -1,5 +1,5 @@
 import type { RuntimeOptionApplyResult, RuntimeOptionId } from "../types";
-import { handleMpvCommandFromIpcService } from "../core/services";
+import { handleMpvCommandFromIpc } from "../core/services";
 import { createMpvCommandRuntimeServiceDeps } from "./dependencies";
 import { SPECIAL_COMMANDS } from "../config";
 
@@ -22,7 +22,7 @@ export function handleMpvCommandFromIpcRuntime(
   command: (string | number)[],
   deps: MpvCommandFromIpcRuntimeDeps,
 ): void {
-  handleMpvCommandFromIpcService(
+  handleMpvCommandFromIpc(
     command,
     createMpvCommandRuntimeServiceDeps({
       specialCommands: SPECIAL_COMMANDS,