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/src/app/api/monitor/start/route.ts

@@ -0,0 +1,45 @@
+import { NextResponse } from "next/server";
+import { getSupabaseAdmin } from "@/lib/admin";
+import { supabase } from "@/lib/supabase";
+
+export async function POST(request: Request) {
+  try {
+    const { websiteId } = await request.json();
+
+    // Create a new scan
+    const { data: scan, error: scanError } = await supabase
+      .from("scans")
+      .insert([
+        {
+          website_id: websiteId,
+          status: "pending",
+        },
+      ])
+      .select()
+      .single();
+
+    if (scanError) throw scanError;
+
+    // Trigger the analysis process
+    const response = await fetch("/api/analyze", {
+      method: "POST",
+      headers: { "Content-Type": "application/json" },
+      body: JSON.stringify({
+        websiteId,
+        scanId: scan.id,
+      }),
+    });
+
+    if (!response.ok) {
+      throw new Error("Failed to start analysis");
+    }
+
+    return NextResponse.json({ success: true, scanId: scan.id });
+  } catch (error) {
+    console.error("Monitor start error:", error);
+    return NextResponse.json(
+      { error: "Failed to start monitoring" },
+      { status: 500 },
+    );
+  }
+}