feat(feedback): add centralized feedback system with AI-generated titles

- Add shared-feedback-types package with TypeScript types
- Add shared-feedback-service package with factory function
- Add shared-feedback-ui package with Svelte 5 components
- Add feedback module to mana-core-auth backend
- Add AI service using Gemini 2.0 Flash for title/category generation
- Add database schema and migration for feedback tables
- Integrate feedback page into Chat web app
- Add CORS support for X-App-Id header
- Add COMMANDS.md documentation for all dev commands

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

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

apps/chat/apps/web/src/lib/services/feedback.ts

@@ -0,0 +1,15 @@
+/**
+ * Feedback Service Instance for Chat Web App
+ */
+
+import { createFeedbackService } from '@manacore/shared-feedback-service';
+import { authStore } from '$lib/stores/auth.svelte';
+import { PUBLIC_MANA_CORE_AUTH_URL } from '$env/static/public';
+
+const MANA_AUTH_URL = PUBLIC_MANA_CORE_AUTH_URL || 'http://localhost:3001';
+
+export const feedbackService = createFeedbackService({
+	apiUrl: MANA_AUTH_URL,
+	appId: 'chat',
+	getAuthToken: async () => authStore.getAccessToken(),
+});

apps/chat/apps/web/src/routes/(protected)/feedback/+page.svelte

@@ -0,0 +1,11 @@
+<script lang="ts">
+	import { FeedbackPage } from '@manacore/shared-feedback-ui';
+	import { feedbackService } from '$lib/services/feedback';
+	import { authStore } from '$lib/stores/auth.svelte';
+</script>
+
+<FeedbackPage
+	{feedbackService}
+	appName="ManaChat"
+	currentUserId={authStore.user?.id}
+/>