New modules:commandTimeoutPredictor、shellAllowlist、observable、promiseUtils、kvStore

[win10ogod]

New modules migrated:

• commandTimeoutPredictor.ts: Smart timeout prediction based on command history
• shellAllowlist.ts: Auto-approval rules for safe shell commands (git, docker, npm, kubectl, etc.)
• observable.ts: Reactive state management with computed values
• promiseUtils.ts: Retry with backoff, DeferredPromise, timeout wrappers
• kvStore.ts: File-based key-value storage with exchange/history managers

Total: 2,400+ lines of code added

[win10ogod]

@CrazyBoyM 你能稍微看一下吗?我新增了一些实用功能