fix(server): use unknown in catch blocks

- file.ts, config.ts: Error | any is redundant (any swallows Error)
  and triggers no-explicit-any. Use unknown and cast only where
  needed (error.stack). Aligns with strict TypeScript and avoids
  masking real errors.

server/src/utils/config.ts

@@ -67,7 +67,7 @@ const loadFromFile = async ({ metadataRepo, logger }: RepoDeps, filepath: string
   try {
     const file = await metadataRepo.readFile(filepath);
     return loadYaml(file) as unknown;
-  } catch (error: Error | any) {
+  } catch (error: unknown) {
     logger.error(`Unable to load configuration file: ${filepath}`);
     logger.error(error);
     throw error;

server/src/utils/file.ts

@@ -71,7 +71,7 @@ export const sendFile = async (
     }
 
     return await _sendFile(file.path, { dotfiles: 'allow' });
-  } catch (error: Error | any) {
+  } catch (error: unknown) {
     // ignore client-closed connection
     if (isConnectionAborted(error) || res.headersSent) {
       return;
@@ -79,7 +79,7 @@ export const sendFile = async (
 
     // log non-http errors
     if (!(error instanceof HttpException)) {
-      logger.error(`Unable to send file: ${error}`, error.stack);
+      logger.error(`Unable to send file: ${error}`, (error as Error).stack);
     }
 
     next(new NotFoundException());