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>

config.d/jason_hsieh

@@ -49,10 +49,10 @@ Host 140.136.202.209
 Host 34.80.116.132
     HostName 34.80.116.132
     IdentityFile /Users/timmy/.ssh/google_compute_engine
-    UserKnownHostsFile=/Users/timmy/.ssh/google_compute_known_hosts
-    # HostKeyAlias=compute.97799509408430482
-    IdentitiesOnly=yes
-    CheckHostIP=no
+    UserKnownHostsFile /Users/timmy/.ssh/google_compute_known_hosts
+    # HostKeyAlias compute.97799509408430482
+    IdentitiesOnly yes
+    CheckHostIP no
 
 # Fu Jen Dev Server (輔大)
 Host fju_dev