feat: implementacion de dashboards por rol, soporte de clases virtuales concurrentes en importador de sheets y cartelera del dia

backend/config/config.py

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+import os
+from dotenv import load_dotenv
+
+basedir = os.path.abspath(os.path.dirname(os.path.dirname(__file__)))
+load_dotenv(os.path.join(basedir, '.env'))
+
+class Config:
+    SECRET_KEY = os.environ.get('SECRET_KEY') or 'dev-secret-key-change-in-production'
+    
+    _db_url = os.environ.get('DATABASE_URL') or 'sqlite:///app.db'
+    if _db_url.startswith('postgres://'):
+        _db_url = _db_url.replace('postgres://', 'postgresql://', 1)
+    SQLALCHEMY_DATABASE_URI = _db_url
+    SQLALCHEMY_TRACK_MODIFICATIONS = False
+    API_BASE_URL = os.environ.get('API_BASE_URL') or 'http://localhost:8080/api'
+    
+    # Pagination
+    ITEMS_PER_PAGE = 20
+    
+    # Upload settings
+    MAX_CONTENT_LENGTH = 16 * 1024 * 1024  # 16MB max file size
+    UPLOAD_FOLDER = 'app/static/uploads'
+    ALLOWED_EXTENSIONS = {'png', 'jpg', 'jpeg', 'gif'}
+    
+    # Internationalization
+    LANGUAGES = ['es', 'en']
+    BABEL_DEFAULT_LOCALE = 'es'
+    BABEL_DEFAULT_TIMEZONE = 'UTC'
+    BABEL_TRANSLATION_DIRECTORIES = os.path.join(basedir, 'translations')