Add CuituNet Intra customer management CMS

Password-protected intranet for managing fiber internet customers:
- Customer table (company, address, speed, price)
- Click row to view full details (contact & billing info)
- Add, edit, delete customers
- Search and sortable columns
- Total billing summary
- PHP + vanilla JS + JSON storage

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

server.py

@@ -0,0 +1,21 @@
+#!/usr/bin/env python3
+import subprocess
+import sys
+
+PORT = 3001
+
+def main():
+    print(f"CuituNet Intra käynnistyy osoitteessa http://localhost:{PORT}")
+    try:
+        subprocess.run(
+            ["php", "-S", f"localhost:{PORT}"],
+            check=True
+        )
+    except KeyboardInterrupt:
+        print("\nSammutettiin.")
+    except FileNotFoundError:
+        print("PHP ei löydy. Asenna PHP ensin.")
+        sys.exit(1)
+
+if __name__ == "__main__":
+    main()