Initial scaffolding for controlled components stories

- Created directory structure for controlled component stories
- Added README with implementation plan and template pattern
- Based on medusa-forms-upgrades branch as requested

Author: codegen-sh[bot]

apps/docs/src/medusa-forms/controlled-components/README.md

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+# Controlled Components Stories Implementation
+
+This directory contains Storybook stories for the Medusa Forms controlled components.
+
+## Implementation Status
+
+- ✅ `ControlledInput` (already exists in parent directory)
+- ❌ `ControlledCheckbox` (needs story)
+- ❌ `ControlledCurrencyInput` (needs story)
+- ❌ `ControlledDatePicker` (needs story)
+- ❌ `ControlledSelect` (needs story)
+- ❌ `ControlledTextArea` (needs story)
+
+## Story Pattern
+
+All stories follow this pattern:
+- Use `react-hook-form` directly with `FormProvider` and `useForm`
+- NO react-router-stub dependencies
+- Follow the pattern established in `ControlledInput.stories.tsx`
+- Include multiple variants and states for each component
+
+## Template Structure
+
+```tsx
+import { ControlledComponent } from '@lambdacurry/medusa-forms/controlled/ControlledComponent';
+import type { Meta, StoryObj } from '@storybook/react-vite';
+import { FormProvider, useForm } from 'react-hook-form';
+
+const meta = {
+  title: 'Medusa Forms/Controlled Component',
+  component: ControlledComponent,
+  parameters: {
+    layout: 'centered',
+  },
+  tags: ['autodocs'],
+} satisfies Meta<typeof ControlledComponent>;
+
+export default meta;
+type Story = StoryObj<typeof meta>;
+
+const ComponentWithHookForm = () => {
+  const form = useForm({
+    defaultValues: {
+      fieldName: '',
+    },
+  });
+
+  return (
+    <FormProvider {...form}>
+      <div className="w-[400px]">
+        <ControlledComponent 
+          name="fieldName" 
+          label="Field Label" 
+          // component-specific props
+        />
+      </div>
+    </FormProvider>
+  );
+};
+
+export const Basic: Story = {
+  render: () => <ComponentWithHookForm />,
+};
+```
+