Architecture Overview

┌─────────────────┐     ┌─────────────────┐     ┌─────────────────┐
│    Frontend     │────▶│     Backend     │────▶│    Services     │
│   (Next.js)     │     │   (Express)     │     │  (AI, Storage)  │
└─────────────────┘     └─────────────────┘     └─────────────────┘
                               │
                               ▼
                        ┌─────────────────┐
                        │    MongoDB      │
                        └─────────────────┘

adminest/
├── frontend/                 # Next.js application
│   ├── src/
│   │   ├── app/             # App router pages
│   │   ├── components/      # React components
│   │   ├── hooks/           # Custom React hooks
│   │   ├── lib/             # Utilities and API client
│   │   └── styles/          # CSS and Tailwind
│   └── public/              # Static assets
│
├── backend/                  # Express API server
│   ├── routes/              # API route handlers
│   ├── models/              # Mongoose schemas
│   ├── services/            # Business logic
│   ├── middleware/          # Auth, validation, etc.
│   └── utils/               # Helper functions
│
├── docs/                     # Internal documentation
└── docs-public/              # Public documentation (Mintlify)

components/
├── documents/
│   ├── DocumentList.tsx     # Document grid/list view
│   ├── DocumentUpload.tsx   # Upload dropzone
│   └── DocumentViewer.tsx   # PDF/image viewer
├── tasks/
│   ├── TaskList.tsx         # Task display
│   ├── TaskForm.tsx         # Create/edit tasks
│   └── TaskCalendar.tsx     # Calendar view
├── chat/
│   └── ChatInterface.tsx    # AI assistant UI
└── shared/
    ├── Layout.tsx           # Page layout
    ├── Sidebar.tsx          # Navigation
    └── Modal.tsx            # Reusable modal

routes/
├── auth.js          # Authentication endpoints
├── documents.js     # Document CRUD + upload
├── tasks.js         # Task management
├── chat.js          # AI assistant
├── calendar.js      # Calendar sync
├── categories.js    # Organization
└── connections.js   # Family sharing

services/
├── documentService.js       # Document processing
├── aiService.js             # OpenAI integration
├── storageService.js        # S3 operations
├── calendarService.js       # Google/Microsoft sync
├── taskService.js           # Task logic
└── weeklyDigestService.js   # Scheduled reports

{
  _id: ObjectId,
  userId: String,              // Auth0 user ID
  originalFileName: String,
  documentType: String,        // AI-detected type
  processingStatus: String,    // pending|processing|completed|failed
  s3Key: String,               // Storage reference
  aiAnalysis: {
    summary: String,
    extractedData: Object,
    suggestedTasks: Array
  },
  categories: [ObjectId],
  sharedWith: [ObjectId],      // Connection references
  createdAt: Date,
  updatedAt: Date
}

{
  _id: ObjectId,
  userId: String,
  title: String,
  description: String,
  dueDate: Date,
  status: String,              // pending|in_progress|completed
  priority: String,            // low|medium|high
  linkedDocument: ObjectId,
  categories: [ObjectId],
  calendarEventId: String,     // External calendar reference
  createdAt: Date,
  updatedAt: Date
}

┌──────────┐     ┌──────────┐     ┌──────────┐     ┌──────────┐
│  User    │────▶│  Auth0   │────▶│ Frontend │────▶│ Backend  │
│          │     │          │     │          │     │          │
│ 1. Login │     │ 2. Auth  │     │ 3. Token │     │ 4. Verify│
└──────────┘     └──────────┘     └──────────┘     └──────────┘

Upload ──▶ S3 Storage ──▶ Text Extraction ──▶ AI Analysis ──▶ Store Results
                              │
                              ▼
                         OCR (if image)