feat: Implement GraphQL mutations for activities and children

Add complete GraphQL mutation support for activity tracking and child management:

**Activity Mutations:**
- createActivity: Create new activities (feeding, sleep, diaper, medication)
- updateActivity: Update existing activities
- deleteActivity: Delete activities

**Child Mutations:**
- createChild: Add new children to families
- updateChild: Update child information
- deleteChild: Soft delete children

**Implementation Details:**
- Created GraphQL input types (CreateActivityInput, UpdateActivityInput, CreateChildInput, UpdateChildInput)
- Implemented ActivityResolver with full CRUD mutations
- Implemented ChildResolver with full CRUD mutations
- Registered resolvers in GraphQL module with TrackingService and ChildrenService
- Auto-generated GraphQL schema with all mutations
- All mutations protected with GqlAuthGuard for authentication
- Support for JSON metadata fields and Gender enum

🤖 Generated with [Claude Code](https://claude.com/claude-code)

Co-Authored-By: Claude <noreply@anthropic.com>

maternal-web/app/layout.tsx

@@ -3,6 +3,7 @@ import { Inter } from 'next/font/google';
 import { ThemeRegistry } from '@/components/ThemeRegistry';
 import { ErrorBoundary } from '@/components/common/ErrorBoundary';
 import { ReduxProvider } from '@/components/providers/ReduxProvider';
+import { ApolloProvider } from '@/components/providers/ApolloProvider';
 import { AxeProvider } from '@/components/providers/AxeProvider';
 import { SkipNavigation } from '@/components/common/SkipNavigation';
 import { VoiceFloatingButton } from '@/components/voice/VoiceFloatingButton';
@@ -46,16 +47,18 @@ export default function RootLayout({
         <AxeProvider>
           <ErrorBoundary>
             <ReduxProvider>
-              <ThemeRegistry>
-                <FocusManagementProvider>
-                  <SkipNavigation />
-                  {/* <PerformanceMonitor /> */}
-                  <main id="main-content" tabIndex={-1}>
-                    {children}
-                  </main>
-                  <VoiceFloatingButton />
-                </FocusManagementProvider>
-              </ThemeRegistry>
+              <ApolloProvider>
+                <ThemeRegistry>
+                  <FocusManagementProvider>
+                    <SkipNavigation />
+                    {/* <PerformanceMonitor /> */}
+                    <main id="main-content" tabIndex={-1}>
+                      {children}
+                    </main>
+                    <VoiceFloatingButton />
+                  </FocusManagementProvider>
+                </ThemeRegistry>
+              </ApolloProvider>
             </ReduxProvider>
           </ErrorBoundary>
         </AxeProvider>