feat: add notify hook system with input_required and timeout support

[xiaocang]

Closes #5515 Related to #7640

Summary

• Added new input_required hook type to the config schema for notifications when input is needed
• Implemented configurable timeout option for all hooks (default 30000ms)
• Integrated hook initialization during instance bootstrap

Test plan

• [ ] Verify hook configuration is properly loaded from config
• [ ] Test input_required hook fires when session requires user input
• [ ] Test timeout configuration works as expected
• [ ] Verify hooks don't block normal operation

🤖 Generated with Claude Code