refactor: rename email-server-worker to email-worker

Rename directory from email-server-worker to email-worker for clarity and brevity. Update all references in CLAUDE.md documentation.

.claude/settings.local.json

@@ -24,7 +24,11 @@
       "Bash(git mv:*)",
       "Bash(rmdir:*)",
       "Bash(mkdir:*)",
-      "Bash(git diff:*)"
+      "Bash(git diff:*)",
+      "Bash(grep:*)",
+      "Bash(for file in CommError HTTPResponseError JsonParsingError clientIpAddress)",
+      "Bash(do echo \"=== $file ===\")",
+      "Bash(done)"
     ]
   },
   "enableAllProjectMcpServers": true,