feat: Initial commit for OnEver Drive centralized backup system with Windows PyQt6 agent and Proxmox LXC deployment

backend/app/core/config.py

@@ -0,0 +1,44 @@
+import os
+from pathlib import Path
+from pydantic_settings import BaseSettings
+
+BASE_DIR = Path(__file__).resolve().parent.parent.parent
+
+class Settings(BaseSettings):
+    PROJECT_NAME: str = "OnEver Drive"
+    VERSION: str = "1.0.0"
+    API_V1_PREFIX: str = "/api"
+    
+    # Environment
+    ENVIRONMENT: str = "development"
+    DEBUG: bool = True
+    
+    # Database: Default to SQLite for seamless local dev & test, configurable to PostgreSQL in production
+    DATABASE_URL: str = f"sqlite+aiosqlite:///{BASE_DIR}/onever_drive.db"
+    
+    # Storage settings
+    STORAGE_ROOT: str = str(BASE_DIR / "storage" / "backups")
+    STORAGE_TEMP_ROOT: str = str(BASE_DIR / "storage" / "temp")
+    
+    # Security
+    SECRET_KEY: str = "onever-drive-super-secret-key-change-in-production-2026"
+    ALGORITHM: str = "HS256"
+    ACCESS_TOKEN_EXPIRE_MINUTES: int = 60 * 24 * 7  # 7 days
+    
+    # Upload & Transfer settings
+    DEFAULT_CHUNK_SIZE: int = 4 * 1024 * 1024  # 4 MB
+    MAX_CHUNK_SIZE: int = 16 * 1024 * 1024     # 16 MB
+    MIN_STABLE_TIME_SECONDS: int = 60          # 60s stability window for locked files
+    
+    # Retention Defaults
+    DEFAULT_RETENTION_DAILY: int = 7
+    DEFAULT_RETENTION_WEEKLY: int = 4
+    DEFAULT_RETENTION_MONTHLY: int = 12
+
+    model_config = {"env_file": ".env", "extra": "allow"}
+
+settings = Settings()
+
+# Ensure storage directories exist
+os.makedirs(settings.STORAGE_ROOT, exist_ok=True)
+os.makedirs(settings.STORAGE_TEMP_ROOT, exist_ok=True)