refactor: flatten monorepo structure to backend/ frontend/ devops/

Rename subdirectories for a cleaner single-repo layout:
- website-monitoring-backend/  → backend/
- website-monitoring-frontend/ → frontend/
- website-monitoring-devops/   → devops/

Update all references in package.json scripts, CI workflows,
docker-compose, pre-commit hooks, and documentation.

Co-authored-by: Copilot <223556219+Copilot@users.noreply.github.com>

frontend/.cursor/mcp.json

@@ -0,0 +1,12 @@
+{
+	"mcpServers": {
+		"task-master-ai": {
+			"command": "npx",
+			"args": ["-y", "--package=task-master-ai", "task-master-ai"],
+			"env": {
+				"OLLAMA_BASE_URL": "http://localhost:11434/api",
+				"MODEL": "devstral:latest"
+			  }
+		}
+	}
+}