Consolidate SSH config: merge duplicate hosts, fix paths and formatting

- Merge same-user hosts into grouped Host entries (timmy, ma)
- Fix ssh_key_management.sh path from ~/Sync to iCloud
- Standardize = syntax to space-separated (jason_hsieh)
- Unify indentation to 4 spaces (config)
- Remove duplicate 192.168.88.173 entry and redundant HostNames

Co-Authored-By: Claude Opus 4.6 (1M context) <noreply@anthropic.com>

ssh_key_management.sh

@@ -14,9 +14,9 @@ export LANGUAGE=en_US:en
 eval $(ssh-agent)
 
 # 將指定路徑的 SSH 私鑰加入到 SSH-Agent 中
-# ssh-add ~/Sync/.ssh/
-ssh-add ~/Sync/.ssh/aws_server_13_113_205_237.pem
-ssh-add ~/Sync/.ssh/aws_server_18_177_222_167.pem
+BASE_DIR="$HOME/Library/Mobile Documents/com~apple~CloudDocs/.ssh"
+ssh-add "$BASE_DIR/aws_server_13_113_205_237.pem"
+ssh-add "$BASE_DIR/aws_server_18_177_222_167.pem"
 
 # 列出已經加入到 SSH-Agent 中的金鑰清單
 ssh-add -l