Implement Django backend and Vue frontend structure

- Django backend with projects, templates, exports apps
- SQLite database models for Project, Asset, CardLayer
- REST API endpoints for project management
- Vue frontend with Vite, Element Plus, Fabric.js
- Home page for project selection
- Editor page with Fabric.js canvas integration

backend/poker_api/settings.py

@@ -0,0 +1,79 @@
+"""
+Django settings for poker_api project.
+"""
+
+from pathlib import Path
+import os
+
+BASE_DIR = Path(__file__).resolve().parent.parent
+
+SECRET_KEY = 'django-insecure-poker-design-local-dev-key-change-in-production'
+
+DEBUG = True
+
+ALLOWED_HOSTS = ['localhost', '127.0.0.1']
+
+INSTALLED_APPS = [
+    'django.contrib.contenttypes',
+    'django.contrib.staticfiles',
+    'rest_framework',
+    'corsheaders',
+    'apps.projects',
+    'apps.templates',
+    'apps.exports',
+]
+
+MIDDLEWARE = [
+    'django.middleware.security.SecurityMiddleware',
+    'django.middleware.common.CommonMiddleware',
+    'corsheaders.middleware.CorsMiddleware',
+    'django.middleware.csrf.CsrfViewMiddleware',
+    'django.middleware.clickjacking.XFrameOptionsMiddleware',
+]
+
+ROOT_URLCONF = 'poker_api.urls'
+
+TEMPLATES = [
+    {
+        'BACKEND': 'django.template.backends.django.DjangoTemplates',
+        'DIRS': [],
+        'APP_DIRS': True,
+        'OPTIONS': {
+            'context_processors': [
+                'django.template.context_processors.debug',
+                'django.template.context_processors.request',
+            ],
+        },
+    },
+]
+
+WSGI_APPLICATION = 'poker_api.wsgi.application'
+
+DATABASES = {
+    'default': {
+        'ENGINE': 'django.db.backends.sqlite3',
+        'NAME': BASE_DIR / 'db.sqlite3',
+    }
+}
+
+LANGUAGE_CODE = 'zh-hans'
+TIME_ZONE = 'Asia/Shanghai'
+USE_I18N = True
+USE_TZ = True
+
+STATIC_URL = 'static/'
+
+MEDIA_URL = '/media/'
+MEDIA_ROOT = BASE_DIR / 'media'
+
+CORS_ALLOWED_ORIGINS = [
+    "http://localhost:5173",
+    "http://127.0.0.1:5173",
+]
+
+CORS_ALLOW_CREDENTIALS = True
+
+REST_FRAMEWORK = {
+    'DEFAULT_PAGINATION': 'rest_framework.pagination.PageNumberPagination',
+    'PAGE_SIZE': 20,
+}