feat(config): unify mpv plugin options under main config and add CSS/Ani

- Replace subminer.conf plugin config with mpv.* fields in config.jsonc
- Add socketPath, backend, autoStartSubMiner, pauseUntilOverlayReady, aniskipEnabled/buttonKey, subminerBinaryPath to mpv config
- Add subtitleSidebar.css field; migrate legacy sidebar appearance fields
- Add paintOrder and WebkitTextStroke to subtitle style options
- Update default subtitle/sidebar fontFamily to CJK-first stack
- Fix overlay visible state surviving mpv y-r restart
- Fix live config saves applying subtitle CSS immediately to open overlays
- Migrate legacy primary/secondary subtitle appearance into subtitleStyle.css on load
- Switch AniSkip button key setting to click-to-learn key capture

src/renderer/renderer.ts

@@ -613,6 +613,8 @@ async function init(): Promise<void> {
     });
   });
 
+  await keyboardHandlers.setupMpvInputForwarding();
+
   let initialSubtitle: SubtitleData | string = '';
   try {
     initialSubtitle = await window.electronAPI.getCurrentSubtitle();
@@ -698,8 +700,6 @@ async function init(): Promise<void> {
     });
   });
   mouseHandlers.setupDragging();
-
-  await keyboardHandlers.setupMpvInputForwarding();
   try {
     ctx.state.controllerConfig = await window.electronAPI.getControllerConfig();
   } catch (error) {