fix(cli): 修复 type/keyboard 的 --delay 参数解析

将 --delay <ms> 从输入文本中剥离并写入 delay 字段，避免搜索词混入参数。

同时支持使用 -- 终止参数解析以输入字面量 --delay 文本，并补充回归测试与帮助文档。

skills/agent-browser/SKILL.md

@@ -63,11 +63,11 @@ agent-browser snapshot -s "#selector" # Scope to CSS selector
 agent-browser click @e1               # Click element
 agent-browser click @e1 --new-tab     # Click and open in new tab
 agent-browser fill @e2 "text"         # Clear and type text
-agent-browser type @e2 "text"         # Type without clearing
+agent-browser type @e2 "text" --delay 120  # Type without clearing (human-like pacing)
 agent-browser select @e1 "option"     # Select dropdown option
 agent-browser check @e1               # Check checkbox
 agent-browser press Enter             # Press key
-agent-browser keyboard type "text"    # Type at current focus (no selector)
+agent-browser keyboard type "text" --delay 90  # Type at current focus (no selector)
 agent-browser keyboard inserttext "text"  # Insert without key events
 agent-browser scroll down 500         # Scroll page