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/components/collaborator-avatars.tsx

@@ -0,0 +1,73 @@
+'use client'
+
+import { Avatar, AvatarFallback, AvatarImage } from '@/components/ui/avatar'
+import { Badge } from '@/components/ui/badge'
+import { Tooltip, TooltipContent, TooltipProvider, TooltipTrigger } from '@/components/ui/tooltip'
+import { useLanguage } from '@/lib/i18n'
+
+interface Collaborator {
+  id: string
+  name: string | null
+  email: string
+  image: string | null
+}
+
+interface CollaboratorAvatarsProps {
+  collaborators: Collaborator[]
+  ownerId: string
+  maxDisplay?: number
+}
+
+export function CollaboratorAvatars({ collaborators, ownerId, maxDisplay = 5 }: CollaboratorAvatarsProps) {
+  const { t } = useLanguage()
+
+  if (collaborators.length === 0) return null
+
+  const displayCollaborators = collaborators.slice(0, maxDisplay)
+  const remainingCount = collaborators.length - maxDisplay
+
+  return (
+    <div className="flex items-center gap-1 mt-2">
+      <TooltipProvider>
+        {displayCollaborators.map((collaborator) => (
+          <Tooltip key={collaborator.id}>
+            <TooltipTrigger asChild>
+              <div className="relative group">
+                <Avatar className="h-6 w-6 border-2 border-background">
+                  <AvatarImage src={collaborator.image || undefined} />
+                  <AvatarFallback className="text-xs">
+                    {collaborator.name?.charAt(0).toUpperCase() || collaborator.email.charAt(0).toUpperCase()}
+                  </AvatarFallback>
+                </Avatar>
+                {collaborator.id === ownerId && (
+                  <div className="absolute -bottom-1 -right-1">
+                    <Badge variant="secondary" className="text-[8px] h-3 px-1 min-w-0">
+                      {t('collaboration.owner')}
+                    </Badge>
+                  </div>
+                )}
+              </div>
+            </TooltipTrigger>
+            <TooltipContent>
+              <p className="font-medium">{collaborator.name || t('collaboration.unnamedUser')}</p>
+              <p className="text-xs text-muted-foreground">{collaborator.email}</p>
+            </TooltipContent>
+          </Tooltip>
+        ))}
+
+        {remainingCount > 0 && (
+          <Tooltip>
+            <TooltipTrigger asChild>
+              <div className="h-6 w-6 rounded-full bg-muted flex items-center justify-center text-xs border-2 border-background">
+                +{remainingCount}
+              </div>
+            </TooltipTrigger>
+            <TooltipContent>
+              <p>{remainingCount} {t('collaboration.canEdit')}</p>
+            </TooltipContent>
+          </Tooltip>
+        )}
+      </TooltipProvider>
+    </div>
+  )
+}