extract monitoring, nvidia, mailserver, cloudflared, kyverno from platform [ci skip]

Phase 2 of platform stack split. 5 more modules extracted into
independent stacks. All applied successfully with zero destroys.
Cloudflared now reads k8s_users from Vault directly to compute
user_domains. Woodpecker pipeline runs all 8 extracted stacks
in parallel. Memory bumped to 6Gi for 9 concurrent TF processes.
Platform reduced from 27 to 19 modules.

stacks/nvidia/modules/nvidia/Dockerfile

@@ -0,0 +1,27 @@
+# GPU container
+
+FROM ubuntu
+
+ENV DEBIAN_FRONTEND=noninteractive
+
+# Install Python and pip
+RUN apt-get update && \
+    apt-get install -y --no-install-recommends \
+        python3 \
+        python3-pip \
+        python3-venv
+
+# Deps
+RUN apt-get install -y ffmpeg espeak-ng
+
+# Set a working directory
+WORKDIR /app
+
+RUN python3 -m venv audiblez && ./audiblez/bin/pip install audiblez
+# RUN python3 -m venv audiblez 
+
+CMD ["/usr/bin/sleep", "86400"]
+# RUN pip install audiblez
+
+# # Default command
+# CMD ["/usr/bin/sleep", "86400"]