Add EvoSync v3 environment scaffold

FastAPI + Celery + Redis + MariaDB stack with 6-service docker-compose.
Includes project skeleton (config, database, models, tasks, migrations)
and health endpoint with passing test.

Co-Authored-By: Claude Sonnet 4.6 <noreply@anthropic.com>

web/config.py

@@ -0,0 +1,31 @@
+from pydantic_settings import BaseSettings
+
+
+class Settings(BaseSettings):
+    DATABASE_URL: str = "mysql+pymysql://evosync:evosync@db:3306/evosync"
+    REDIS_URL: str = "redis://redis:6379/0"
+    SECRET_KEY: str = "change-me-in-production"
+    BASE_URL: str = "http://localhost:8000"
+    PASSWORD_RESET_EXPIRE_MINUTES: int = 60
+
+    EVOTOR_APP_ID: str = ""
+    EVOTOR_WEBHOOK_SECRET: str = ""
+
+    JIVOSITE_WIDGET_ID: str = ""
+    VK_DEFAULT_PHOTO_PATH: str = "/app/default_product.png"
+    VK_API_VERSION: str = "5.199"
+
+    CATALOG_REFRESH_INTERVAL_SECONDS: int = 3600
+
+    FLOWER_USER: str = "admin"
+    FLOWER_PASSWORD: str = "changeme"
+
+    DB_ROOT_PASSWORD: str = ""
+    DB_NAME: str = ""
+    DB_USER: str = ""
+    DB_PASSWORD: str = ""
+
+    model_config = {"env_file": ".env", "case_sensitive": False, "extra": "ignore"}
+
+
+settings = Settings()