feat: add /ego-mgr slash command

Add /ego-mgr slash command with subcommands:
- get, set, list, delete, add-column, add-public-column, show
- Uses pcexec to call ego-mgr binary with proper env vars

Translate all Chinese text to English in responses.

Note: pcexec tool name and function names remain unchanged.

plugin/commands/slash-commands.ts

@@ -48,7 +48,7 @@ export class SlashCommandHandler {
   async handle(command: string, userId: string): Promise<void> {
     // Check authorization
     if (!this.authorizedUsers.includes(userId)) {
-      await this.onReply('❌ 无权执行此命令');
+      await this.onReply('Unauthorized');
       return;
     }
 
@@ -68,10 +68,10 @@ export class SlashCommandHandler {
         break;
       default:
         await this.onReply(
-          '用法:\n' +
-          '`/padded-cell-ctrl status` - 查看状态\n' +
-          '`/padded-cell-ctrl enable pass-mgr|safe-restart` - 启用功能\n' +
-          '`/padded-cell-ctrl disable pass-mgr|safe-restart` - 禁用功能'
+          'Usage:\n' +
+          '`/padded-cell-ctrl status` - Show status\n' +
+          '`/padded-cell-ctrl enable pass-mgr|safe-restart` - Enable feature\n' +
+          '`/padded-cell-ctrl disable pass-mgr|safe-restart` - Disable feature'
         );
     }
   }
@@ -81,12 +81,12 @@ export class SlashCommandHandler {
     const agents = this.statusManager.getAllAgents();
 
     const lines = [
-      '**PaddedCell 状态**',
+      '**PaddedCell Status**',
       '',
-      `🔐 密码管理: ${this.state.passMgrEnabled ? '✅ 启用' : '❌ 禁用'}`,
-      `🔄 安全重启: ${this.state.safeRestartEnabled ? '✅ 启用' : '❌ 禁用'}`,
+      `Secret Manager: ${this.state.passMgrEnabled ? 'Enabled' : 'Disabled'}`,
+      `Safe Restart: ${this.state.safeRestartEnabled ? 'Enabled' : 'Disabled'}`,
       '',
-      '**Agent 状态:**',
+      '**Agent Status:**',
     ];
 
     for (const agent of agents) {
@@ -95,14 +95,14 @@ export class SlashCommandHandler {
     }
 
     if (agents.length === 0) {
-      lines.push('(暂无 agent 注册)');
+      lines.push('(No agents registered)');
     }
 
     if (global.restartStatus !== 'idle') {
       lines.push('');
-      lines.push(`⚠️ 重启状态: ${global.restartStatus}`);
+      lines.push(`Restart Status: ${global.restartStatus}`);
       if (global.restartScheduledBy) {
-        lines.push(`   由 ${global.restartScheduledBy} 发起`);
+        lines.push(`   Initiated by ${global.restartScheduledBy}`);
       }
     }
 
@@ -111,12 +111,12 @@ export class SlashCommandHandler {
 
   private async handleEnable(feature: 'pass-mgr' | 'safe-restart'): Promise<void> {
     if (!this.isValidFeature(feature)) {
-      await this.onReply('❌ 未知功能。可用选项: pass-mgr, safe-restart');
+      await this.onReply('Unknown feature. Available: pass-mgr, safe-restart');
       return;
     }
 
     if (this.isOnCooldown(feature)) {
-      await this.onReply('⏳ 该功能最近刚被修改过，请稍后再试');
+      await this.onReply('This feature was recently modified. Please try again later.');
       return;
     }
 
@@ -127,17 +127,17 @@ export class SlashCommandHandler {
     }
 
     this.state.lastToggle[feature] = Date.now();
-    await this.onReply(`✅ 已启用 ${feature}`);
+    await this.onReply(`Enabled ${feature}`);
   }
 
   private async handleDisable(feature: 'pass-mgr' | 'safe-restart'): Promise<void> {
     if (!this.isValidFeature(feature)) {
-      await this.onReply('❌ 未知功能。可用选项: pass-mgr, safe-restart');
+      await this.onReply('Unknown feature. Available: pass-mgr, safe-restart');
       return;
     }
 
     if (this.isOnCooldown(feature)) {
-      await this.onReply('⏳ 该功能最近刚被修改过，请稍后再试');
+      await this.onReply('This feature was recently modified. Please try again later.');
       return;
     }
 
@@ -148,7 +148,7 @@ export class SlashCommandHandler {
     }
 
     this.state.lastToggle[feature] = Date.now();
-    await this.onReply(`✅ 已禁用 ${feature}`);
+    await this.onReply(`Disabled ${feature}`);
   }
 
   private isValidFeature(feature: string): feature is 'pass-mgr' | 'safe-restart' {