Clean up attachment objects on issue delete and suppress responseTime in logs

Delete storage objects for each attachment when an issue is removed.
Hide responseTime from pino-pretty console output to reduce noise.

Co-Authored-By: Claude Opus 4.6 <noreply@anthropic.com>

server/src/middleware/logger.ts

@@ -19,7 +19,7 @@ export const logger = pino({
   targets: [
     {
       target: "pino-pretty",
-      options: { ...sharedOpts, ignore: "pid,hostname,req,res", colorize: true, destination: 1 },
+      options: { ...sharedOpts, ignore: "pid,hostname,req,res,responseTime", colorize: true, destination: 1 },
       level: "info",
     },
     {