feat(mcp): add Model Context Protocol integration

Add  MCP integration including:
- New MCP settings tab with server configuration
- Tool invocation UI components
- API endpoints for MCP management
- Integration with chat system for tool execution
- Example configurations

app/routes/api.mcp-update-config.ts

@@ -0,0 +1,23 @@
+import { type ActionFunctionArgs } from '@remix-run/cloudflare';
+import { createScopedLogger } from '~/utils/logger';
+import { MCPService, type MCPConfig } from '~/lib/services/mcpService';
+
+const logger = createScopedLogger('api.mcp-update-config');
+
+export async function action({ request }: ActionFunctionArgs) {
+  try {
+    const mcpConfig = (await request.json()) as MCPConfig;
+
+    if (!mcpConfig || typeof mcpConfig !== 'object') {
+      return Response.json({ error: 'Invalid MCP servers configuration' }, { status: 400 });
+    }
+
+    const mcpService = MCPService.getInstance();
+    const serverTools = await mcpService.updateConfig(mcpConfig);
+
+    return Response.json(serverTools);
+  } catch (error) {
+    logger.error('Error updating MCP config:', error);
+    return Response.json({ error: 'Failed to update MCP config' }, { status: 500 });
+  }
+}