[ci skip] Move Terraform modules into stack directories

Move all 88 service modules (66 individual + 22 platform) from
modules/kubernetes/<service>/ into their corresponding stack directories:

- Service stacks: stacks/<service>/module/
- Platform stack: stacks/platform/modules/<service>/

This collocates module source code with its Terragrunt definition.
Only shared utility modules remain in modules/kubernetes/:
ingress_factory, setup_tls_secret, dockerhub_secret, oauth-proxy.

All cross-references to shared modules updated to use correct
relative paths. Verified with terragrunt run --all -- plan:
0 adds, 0 destroys across all 68 stacks.

stacks/platform/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"]