chore: clean up repo for public release

- Remove BMAD framework, IDE configs, dev screenshots, test files,
  internal docs, and backup files
- Rename keep-notes/ to memento-note/
- Update all references from keep-notes to memento-note
- Add Apache 2.0 license with Commons Clause (non-commercial restriction)
- Add clean .gitignore and .env.docker.example

memento-note/app/api/ai/suggest-notebook/route.ts

@@ -0,0 +1,46 @@
+import { NextRequest, NextResponse } from 'next/server'
+import { auth } from '@/auth'
+import { notebookSuggestionService } from '@/lib/ai/services/notebook-suggestion.service'
+
+export async function POST(req: NextRequest) {
+  try {
+    const session = await auth()
+    if (!session?.user?.id) {
+      return NextResponse.json({ error: 'Unauthorized' }, { status: 401 })
+    }
+
+    const body = await req.json()
+    const { noteContent, language = 'en' } = body
+
+    if (!noteContent || typeof noteContent !== 'string') {
+      return NextResponse.json({ error: 'noteContent is required' }, { status: 400 })
+    }
+
+    // Minimum content length for suggestion (20 words as per specs)
+    const wordCount = noteContent.trim().split(/\s+/).length
+    if (wordCount < 20) {
+      return NextResponse.json({
+        suggestion: null,
+        reason: 'content_too_short',
+        message: 'Note content too short for meaningful suggestion'
+      })
+    }
+
+    // Get suggestion from AI service
+    const suggestedNotebook = await notebookSuggestionService.suggestNotebook(
+      noteContent,
+      session.user.id,
+      language
+    )
+
+    return NextResponse.json({
+      suggestion: suggestedNotebook,
+      confidence: suggestedNotebook ? 0.8 : 0 // Placeholder confidence score
+    })
+  } catch (error) {
+    return NextResponse.json(
+      { error: 'Failed to generate suggestion' },
+      { status: 500 }
+    )
+  }
+}