[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/f1-stream/module/files/Dockerfile

@@ -0,0 +1,21 @@
+FROM golang:1.24-alpine AS builder
+WORKDIR /app
+COPY go.mod go.sum ./
+RUN go mod download
+COPY . .
+RUN CGO_ENABLED=0 GOOS=linux go build -o /f1-stream .
+
+FROM alpine:3.20
+RUN apk add --no-cache \
+    ca-certificates \
+    chromium nss freetype harfbuzz ttf-freefont \
+    mesa-dri-gallium mesa-gl \
+    dbus \
+    xvfb-run xorg-server \
+    pulseaudio pulseaudio-utils \
+    ffmpeg
+ENV CHROME_PATH=/usr/bin/chromium-browser
+COPY --from=builder /f1-stream /f1-stream
+COPY static/ /static/
+EXPOSE 8080
+ENTRYPOINT ["/f1-stream"]