feat(ff-ssh): add host from ssh args with ssh-copy-id

- ff ssh <ssh-args> parses target like ssh, runs ssh-copy-id, then
  writes ~/.ssh/config.d/<alias>.conf (HostName/User/Port/IdentityFile/
  ProxyJump/ProxyCommand); supports --no-copy, add and run subcommands
- record IdentityFile whenever -i / -o IdentityFile= is given and pass
  the same key to ssh-copy-id; omit it otherwise so ssh falls back to
  default identities
- ff ssh re-sources ff-ssh.fish each call, ff reload clears cached
  dotfile functions so edits take effect
- fix broken copy subcommand and ssh-arg parsing caused by
  --argument-names argv shadowing fish $argv
- fix ssh subcommand completion guards; wrap ssh completions for add/run

fish/functions/ff.fish

@@ -14,7 +14,7 @@ function ff
         "s|Alias for script" \
         "update|Update dotfile" \
         "region|Toggle or set CN_REGION (mirror/proxy region)" \
-        "ssh|SSH init (keys + config.d) or copy config to remote" \
+        "ssh|SSH init, copy key + add host config, or copy config to remote" \
         "dirsize|Show directory sizes (du wrapper)" \
         "help|Show this help message"
 
@@ -28,6 +28,11 @@ function ff
 
     switch $argv[1]
         case reload
+            # autoload 会缓存函数定义，先清掉 dotfile 里的函数再重载
+            for __f in ~/.dotfile/fish/functions/*.fish
+                functions -e (basename $__f .fish) 2>/dev/null
+            end
+            set -e __f
             source ~/.config/fish/config.fish
             echo "Fish configuration reloaded!"
         case edit
@@ -95,9 +100,8 @@ function ff
                 return 1
             end
         case ssh
-            if not functions -q ff_ssh
-                source ~/.dotfile/fish/functions/ff-ssh.fish
-            end
+            # 每次都重新 source，避免 autoload 缓存旧定义
+            source ~/.dotfile/fish/functions/ff-ssh.fish
             ff_ssh $argv[2..-1]
         case dirsize
             set -l script_path ~/.dotfile/script/dirsize.sh