chore: remove old migration guide, add readme

README.md

+# NexCampus BE - Intern Management System
+
+Backend API service for managing interns, supervisors (leaders), tasks, submissions, evaluations, and notifications.
+
+## Tech Stack
+- **Node.js** & **Express** with **TypeScript**
+- **Prisma ORM** with **PostgreSQL** (Supabase)
+- **JWT Authentication** & **Role-Based Access Control**
+- **Zod** for schema validation
+
+---
+
+## Database Design & Models
+
+The system is structured around 12 core models:
+1. **Role**: Represents user authorizations (`ADMIN`, `LEADER`, `INTERN`).
+2. **User**: Credentials, active status, and role reference.
+3. **Application**: Registry/application form details. Spawns a User account upon approval.
+4. **InternProfile**: Profile details for approved interns, linking them to their corresponding `User` and supervisor (`User` with role `LEADER`).
+5. **NotificationSetting**: Communication channels configuration per user.
+6. **Task**: Assignments created by administrators or leaders.
+7. **TaskAssignment**: Task assignations linking exactly one task to one intern.
+8. **TaskSubmission**: Intern submissions containing code links (PR), video demos, notes, and reviewer comments. Supports multiple attempts.
+9. **DailyReport**: Log reports written daily by interns.
+10. **WeeklyEvaluation**: Evaluative scoring (communication, attitude, learning, coding, total score) performed weekly by leaders.
+11. **Notification**: In-app notifications.
+12. **NotificationLog**: Delivery logs tracking web, email, and Discord channel notifications.
+
+---
+
+## Getting Started
+
+### Prerequisites
+- Node.js (v18+)
+- pnpm (recommended) or npm
+
+### Installation
+1. Clone the repository
+2. Install dependencies:
+   ```bash
+   pnpm install
+   ```
+3. Set up your environment file:
+   - Copy `.env.example` to `.env`
+   - Fill in your connection strings and JWT keys:
+     ```env
+     DATABASE_URL=your_supabase_pooler_url
+     DIRECT_URL=your_supabase_direct_url
+     JWT_ACCESS_SECRET=your_access_secret
+     JWT_REFRESH_SECRET=your_refresh_secret
+     ```
+
+### Database Initialization
+Apply migrations and run the seeding script to populate initial roles and create the default admin account:
+```bash
+# Validate schema
+npx prisma validate
+
+# Run migrations
+npx prisma migrate dev --name init_intern_mgmt
+
+# Seed initial data (Roles & Default Admin)
+npm run db:seed
+```
+*Default Admin credentials:*
+- **Email**: `admin@nexcampus.local`
+- **Password**: `Admin@123456`
+
+### Running the App
+Start the development server:
+```bash
+npm run dev
+```
+
+The server runs on http://localhost:3000 by default.
+
+---
+
+## API Endpoints
+
+- **Auth Routing (`/api/v1/auth`)**:
+  - `POST /login`: User authentication.
+  - `GET /me`: Get current authenticated user details.
+- **Users Routing (`/api/v1/users`)** (Admin only):
+  - `GET /`: Get all users.
+  - `GET /:id`: Get user details by ID.
+  - `POST /`: Create a new user account.
+  - `PUT /:id`: Update user details.