[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/dbaas/postgres/postgres_Dockerfile

@@ -0,0 +1,30 @@
+# Use the PostGIS image as the base
+FROM pgvector/pgvector:0.8.0-pg16 as binary
+FROM postgis/postgis:16-master
+COPY --from=binary /pgvecto-rs-binary-release.deb /tmp/vectors.deb
+RUN apt-get install -y /tmp/vectors.deb && rm -f /tmp/vectors.deb
+
+# Install necessary packages
+RUN apt-get update \
+    && apt-get install -y --no-install-recommends \
+    build-essential \
+    libpq-dev \
+    wget \
+    git \
+    postgresql-server-dev-16 \
+    postgresql-16-pgvector \
+    # Clean up to reduce layer size
+    && rm -rf /var/lib/apt/lists/* \
+    && cd /tmp \
+    && git clone --branch v0.8.0 https://github.com/pgvector/pgvector.git \
+    && cd pgvector \
+    && make \
+    && make install \
+    # Clean up unnecessary files
+    && cd - \
+    && apt-get purge -y --auto-remove build-essential postgresql-server-dev-16 libpq-dev wget git \
+    && rm -rf /tmp/pgvector
+
+# Copy initialization scripts
+#COPY ./docker-entrypoint-initdb.d/ /docker-entrypoint-initdb.d/
+CMD ["postgres", "-c" ,"shared_preload_libraries=vectors.so", "-c", "search_path=\"$user\", public, vectors", "-c", "logging_collector=on"]