docs: replace placeholder variables with concrete driver instances in code examples

Co-authored-by: hotlong <50353452+hotlong@users.noreply.github.com>

Author: Copilot

content/blog/security-by-design.mdx

@@ -407,10 +407,12 @@ When using `@objectstack/plugin-hono-server`, CSRF protection is enabled by defa
 ```typescript
 import { ObjectStackKernel } from '@objectstack/runtime';
 import { HonoServerPlugin } from '@objectstack/plugin-hono-server';
+import { ObjectQLPlugin } from '@objectql/core';
+import { MemoryDriver } from '@objectql/driver-memory';
 
 const kernel = new ObjectStackKernel([
   appConfig,
-  myDriver,
+  new MemoryDriver(),
   new ObjectQLPlugin(),
   new HonoServerPlugin({
     port: 3000,

content/docs/reference/api/attachments.mdx

@@ -1084,10 +1084,11 @@ ObjectQL provides a flexible file storage abstraction that supports multiple bac
 import { ObjectStackKernel } from '@objectstack/runtime';
 import { HonoServerPlugin } from '@objectstack/plugin-hono-server';
 import { ObjectQLPlugin } from '@objectql/core';
+import { SqlDriver } from '@objectql/driver-sql';
 
 const kernel = new ObjectStackKernel([
   appConfig,
-  myDriver,
+  new SqlDriver({ client: 'sqlite3', connection: { filename: ':memory:' } }),
   new ObjectQLPlugin(),
   new HonoServerPlugin({
     port: 3000,
@@ -1107,7 +1108,7 @@ await kernel.start();
 ```typescript
 const kernel = new ObjectStackKernel([
   appConfig,
-  myDriver,
+  new SqlDriver({ client: 'sqlite3', connection: { filename: ':memory:' } }),
   new ObjectQLPlugin(),
   new HonoServerPlugin({
     port: 3000,

content/docs/reference/api/custom-routes.mdx

@@ -31,12 +31,14 @@ Configure custom routes when creating the Kernel with protocol plugins:
 ```typescript
 import { ObjectStackKernel } from '@objectstack/runtime';
 import { HonoServerPlugin } from '@objectstack/plugin-hono-server';
+import { ObjectQLPlugin } from '@objectql/core';
 import { JSONRPCPlugin } from '@objectql/protocol-json-rpc';
+import { MemoryDriver } from '@objectql/driver-memory';
 
 // Define custom routes via plugin configuration
 const kernel = new ObjectStackKernel([
   appConfig,
-  myDriver,
+  new MemoryDriver(),
   new ObjectQLPlugin(),
   new JSONRPCPlugin({ basePath: '/v1/rpc' }),
   new HonoServerPlugin({

content/docs/reference/api/graphql.mdx

@@ -903,10 +903,14 @@ function UserList() {
 ObjectQL doesn't include GraphQL Playground by default, but you can easily add it:
 
 ```typescript
+import { ObjectStackKernel } from '@objectstack/runtime';
 import { GraphQLPlugin } from '@objectql/protocol-graphql';
+import { ObjectQLPlugin } from '@objectql/core';
+import { MemoryDriver } from '@objectql/driver-memory';
 
 const kernel = new ObjectStackKernel([
-  myDriver,
+  appConfig,
+  new MemoryDriver(),
   new ObjectQLPlugin(),
   new GraphQLPlugin({
     port: 4000,