feat: add MCP server support for AI agents

Add Model Context Protocol (MCP) server integration to extend AI agent
capabilities with external tools. This allows users to configure MCP
servers (stdio, SSE, HTTP) in global settings and have agents use them.

Note: MCP servers are currently configured globally. Per-project MCP
server configuration is planned for a future update.

Features:
- New MCP Servers settings section with full CRUD operations
- Import/Export JSON configs (Claude Code format compatible)
- Configurable permission settings:
  - Auto-approve MCP tools (bypass permission prompts)
  - Unrestricted tools (allow all tools when MCP enabled)
- Refresh button to reload from settings file

Implementation:
- Added MCPServerConfig and MCPToolInfo types
- Added store actions for MCP server management
- Updated claude-provider to use configurable MCP permissions
- Updated sdk-options factory functions for MCP support
- Added settings helpers for loading MCP configs

apps/server/src/services/agent-service.ts

@@ -21,6 +21,8 @@ import {
   getAutoLoadClaudeMdSetting,
   getEnableSandboxModeSetting,
   filterClaudeMdFromContext,
+  getMCPServersFromSettings,
+  getMCPPermissionSettings,
 } from '../lib/settings-helpers.js';
 
 interface Message {
@@ -227,6 +229,12 @@ export class AgentService {
         '[AgentService]'
       );
 
+      // Load MCP servers from settings (global setting only)
+      const mcpServers = await getMCPServersFromSettings(this.settingsService, '[AgentService]');
+
+      // Load MCP permission settings (global setting only)
+      const mcpPermissions = await getMCPPermissionSettings(this.settingsService, '[AgentService]');
+
       // Load project context files (CLAUDE.md, CODE_QUALITY.md, etc.)
       const contextResult = await loadContextFiles({
         projectPath: effectiveWorkDir,
@@ -252,6 +260,9 @@ export class AgentService {
         abortController: session.abortController!,
         autoLoadClaudeMd,
         enableSandboxMode,
+        mcpServers: Object.keys(mcpServers).length > 0 ? mcpServers : undefined,
+        mcpAutoApproveTools: mcpPermissions.mcpAutoApproveTools,
+        mcpUnrestrictedTools: mcpPermissions.mcpUnrestrictedTools,
       });
 
       // Extract model, maxTurns, and allowedTools from SDK options
@@ -275,6 +286,9 @@ export class AgentService {
         settingSources: sdkOptions.settingSources,
         sandbox: sdkOptions.sandbox, // Pass sandbox configuration
         sdkSessionId: session.sdkSessionId, // Pass SDK session ID for resuming
+        mcpServers: Object.keys(mcpServers).length > 0 ? mcpServers : undefined, // Pass MCP servers configuration
+        mcpAutoApproveTools: mcpPermissions.mcpAutoApproveTools, // Pass MCP auto-approve setting
+        mcpUnrestrictedTools: mcpPermissions.mcpUnrestrictedTools, // Pass MCP unrestricted tools setting
       };
 
       // Build prompt content with images