fix: copy button HTTP fallback, reset-admin-password in Docker, scripts volume

- CellNetwork.jsx CopyButton: use execCommand fallback when clipboard API
  is unavailable (HTTP non-localhost context)
- Makefile reset-admin-password: run inside cell-api container via docker exec
  so bcrypt and all deps are available without host installation
- docker-compose.yml: mount ./scripts:/app/scripts:ro in cell-api so the
  reset script is accessible inside the container
- scripts/reset_admin_password.py: auto-detect API module path and data dir
  so the script works in both host (api/ sibling) and container (/app) layouts

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

webui/src/pages/CellNetwork.jsx

@@ -23,7 +23,17 @@ const SERVICE_DEFS = [
 function CopyButton({ text, small }) {
   const [copied, setCopied] = useState(false);
   const copy = () => {
-    navigator.clipboard.writeText(text);
+    if (navigator.clipboard && window.isSecureContext) {
+      navigator.clipboard.writeText(text);
+    } else {
+      const el = document.createElement('textarea');
+      el.value = text;
+      el.style.cssText = 'position:fixed;opacity:0;top:0;left:0';
+      document.body.appendChild(el);
+      el.select();
+      document.execCommand('copy');
+      document.body.removeChild(el);
+    }
     setCopied(true);
     setTimeout(() => setCopied(false), 1500);
   };