feat: expand hot-reload to logging, jimaku, subsync, and Anki sub-fields

- Mark logging.level, stats keys, jimaku.*, subsync.*, and granular ankiConnect fields (knownWords, nPlusOne, fields, isLapis, isKiku, behavior) as hot-reloadable
- Refactor classifyConfigHotReloadDiff to path-walk diffing instead of per-key branches
- Wire setLogLevel, invalidateTokenizationCache, refreshSubtitlePrefetch, refreshCurrentSubtitle into hot-reload applied handler
- Exclude ai.* and ankiConnect.ai.* prefixes from config window; hide fields.translation
- Update docs and config.example.jsonc hot-reload annotations

src/main.ts

@@ -1777,6 +1777,18 @@ const buildConfigHotReloadAppliedMainDepsHandler = createBuildConfigHotReloadApp
         appState.ankiIntegration.applyRuntimeConfigPatch(patch);
       }
     },
+    invalidateTokenizationCache: () => {
+      subtitleProcessingController.invalidateTokenizationCache();
+    },
+    refreshSubtitlePrefetch: () => {
+      subtitlePrefetchService?.onSeek(lastObservedTimePos);
+    },
+    refreshCurrentSubtitle: () => {
+      subtitleProcessingController.refreshCurrentSubtitle(appState.currentSubText);
+    },
+    setLogLevel: (level) => {
+      setLogLevel(level, 'config');
+    },
   },
 );
 const applyConfigHotReloadDiff = createConfigHotReloadAppliedHandler(