Initial commit: Harbor batch management tools

Add scripts for Harbor user and project management:
- register.py: Bulk user registration from Excel
- delete_users.py: Complete user deletion with resource cleanup
- delete_projects.py: Targeted deletion of student projects (stu01-stu49)
- CLAUDE.md: Project documentation and API guidance
- requirements.txt: Python dependencies

🤖 Generated with [Claude Code](https://claude.ai/code)

Co-Authored-By: Claude <noreply@anthropic.com>

CLAUDE.md

@@ -0,0 +1,110 @@
+# CLAUDE.md
+
+This file provides guidance to Claude Code (claude.ai/code) when working with code in this repository.
+
+## Project Overview
+
+This is a Harbor container registry user management tool written in Python. It provides functionality to:
+- Register/create Harbor users from Excel data (`register.py`)
+- Delete Harbor users individually or in batches (`delete_users.py`, `delete_users_fixed.py`)
+
+The application interacts with Harbor's REST API v2.0 at `https://harbor.seahi.me`.
+
+## Setup and Environment
+
+### Dependencies Installation
+```bash
+pip install -r requirements.txt
+```
+
+### Virtual Environment Setup
+```bash
+# Activate existing virtual environment
+source venv/bin/activate  # On Unix/macOS
+# or
+venv\Scripts\activate     # On Windows
+```
+
+## Core Architecture
+
+### Data Flow
+1. **Input**: Excel file (`users.xlsx`) with user data (username, realname, password, email)
+2. **Authentication**: HTTP Basic Auth with Harbor admin credentials
+3. **API Operations**: REST API calls to Harbor's `/api/v2.0/users` endpoint
+4. **Error Handling**: Comprehensive exception handling with Chinese language user feedback
+
+### Key Components
+
+- **Authentication**: `get_admin_credentials()` - Interactive credential collection with getpass
+- **User Operations**: 
+  - `create_harbor_user()` - User creation via POST (register.py:20)
+  - `delete_harbor_user()` - User deletion via DELETE (requires user ID lookup)
+  - `get_user_id_by_username()` - User ID resolution from username
+- **Excel Processing**: `pd.read_excel()` with `skiprows=1` to handle header row
+- **Connection Testing**: `test_api_connection()` validates API connectivity and auth (delete_users_fixed.py:20)
+- **Interactive Modes**: `delete_users_fixed.py` provides menu-driven user interaction
+
+### File Structure
+- `register.py` - User registration from Excel
+- `delete_users.py` - Basic user deletion tool
+- `delete_users_fixed.py` - Enhanced deletion tool with better error handling and interactive modes
+- `users.xlsx` - Excel data source (not in version control)
+- `requirements.txt` - Python dependencies
+
+## Common Commands
+
+### Environment Setup
+```bash
+# Activate virtual environment (required before running scripts)
+source venv/bin/activate
+
+# Install dependencies
+pip install -r requirements.txt
+```
+
+### Run Scripts
+```bash
+# Register users from Excel file
+python register.py
+
+# Delete users (recommended enhanced version)
+python delete_users_fixed.py
+
+# Delete users (basic version)
+python delete_users.py
+```
+
+### Development
+```bash
+# Check Python syntax
+python -m py_compile register.py
+python -m py_compile delete_users_fixed.py
+
+# Run with verbose output for debugging
+python -v register.py
+```
+
+## API Configuration
+
+- Harbor URL: `https://harbor.seahi.me`
+- API Version: v2.0
+- Authentication: HTTP Basic Auth
+- SSL Verification: Disabled (`verify=False`)
+- HTTPS Warnings: Suppressed via urllib3
+
+## Excel File Format
+
+Expected structure for `users.xlsx`:
+- Row 1: Headers (skipped)
+- Column 0: Username
+- Column 1: Real name  
+- Column 2: Password
+- Column 4: Email address
+
+## Error Handling Patterns
+
+- HTTP 409: User already exists (treated as success for registration)
+- HTTP 401: Authentication failure
+- HTTP 404: User not found
+- HTTP 412: User has dependencies (cannot delete)
+- Connection timeouts and network errors are handled gracefully