修复审批请求在聊天中无提示且无法响应 (#467)

* fix: support run approval prompts in chat

* fix(chat): render approval prompts

* fix(chat): dedupe approval pattern labels

* chore: sync approval flow with current main

- update Hermes Agent approval support guidance to PR #21899
- initialize Hermes table schemas in session-sync tests

packages/client/src/utils/approval-commands.ts

@@ -0,0 +1,29 @@
+export type ApprovalChoice = 'once' | 'session' | 'always' | 'deny'
+
+export interface ApprovalCommand {
+  choice: ApprovalChoice
+  all: boolean
+}
+
+const APPROVAL_COMMAND_RE = /^\/(approve|deny)(?:\s+(session|always|all))?\s*$/i
+
+export function parseApprovalCommand(input: string): ApprovalCommand | null {
+  const match = input.trim().match(APPROVAL_COMMAND_RE)
+  if (!match) return null
+
+  const verb = match[1].toLowerCase()
+  const modifier = match[2]?.toLowerCase()
+
+  if (verb === 'deny') {
+    if (modifier && modifier !== 'all') return null
+    return { choice: 'deny', all: modifier === 'all' }
+  }
+
+  if (modifier === 'session') return { choice: 'session', all: false }
+  if (modifier === 'always') return { choice: 'always', all: false }
+  return { choice: 'once', all: modifier === 'all' }
+}
+
+export function isApprovalCommand(input: string): boolean {
+  return parseApprovalCommand(input) != null
+}