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/lib/connections-cache.ts

@@ -0,0 +1,37 @@
+// Cache with TTL for 15 minutes
+const CACHE_TTL = 15 * 60 * 1000 // 15 minutes
+
+interface CacheEntry {
+  count: number
+  timestamp: number
+}
+
+const cache = new Map<string, CacheEntry>()
+
+export async function getConnectionsCount(noteId: string): Promise<number> {
+  const now = Date.now()
+  const cached = cache.get(noteId)
+
+  if (cached && (now - cached.timestamp) < CACHE_TTL) {
+    return cached.count
+  }
+
+  try {
+    const res = await fetch(`/api/ai/echo/connections?noteId=${noteId}&limit=1`)
+    if (!res.ok) {
+    throw new Error('Failed to fetch connections')
+  }
+  const data = await res.json()
+  const count = data.pagination?.total || 0
+
+  // Update cache for future calls
+  if (count > 0) {
+    cache.set(noteId, { count, timestamp: Date.now() })
+  }
+
+  return count
+  } catch (error) {
+    console.error('[ConnectionsCache] Failed to fetch connections:', error)
+    return 0
+  }
+}