Reworked variable system, no longer hardcoded

backend/.env.example

@@ -0,0 +1,14 @@
+# Database Configuration
+DATABASE_URL=sqlite:///./tesseract.db
+
+# API Configuration
+API_TITLE=Tesseract - Nested Todo Tree API
+API_DESCRIPTION=API for managing deeply nested todo trees
+API_VERSION=1.0.0
+
+# CORS Configuration (comma-separated list of allowed origins)
+CORS_ORIGINS=http://localhost:5173,http://localhost:3000
+
+# Server Configuration
+HOST=0.0.0.0
+PORT=8000