feat(hachidori): derive Docker management URL from the linked host

- Default character dictionary uploads to the linked host on port 8780; externalHostManagementUrl is now an optional override
- Warn when the override points at a different machine than the link
- Browser/app hosts report where to import the merged ZIP manually
- Name the management origin when the upload request cannot connect
- Update config descriptions, generated examples, docs, and changelog fragment

src/main.ts

@@ -2727,6 +2727,7 @@ const characterDictionaryAutoSyncRuntime = createCharacterDictionaryAutoSyncRunt
       {
         error: (message, ...args) => logger.error(message, ...args),
         info: (message, ...args) => logger.info(message, ...args),
+        warn: (message, ...args) => logger.warn(message, ...args),
       },
       configService.getConfig().hachidori.externalHostManagementUrl,
     );