[ci skip] Flatten module wrappers into stack roots

Remove the module "xxx" { source = "./module" } indirection layer
from all 66 service stacks. Resources are now defined directly in
each stack's main.tf instead of through a wrapper module.

- Merge module/main.tf contents into stack main.tf
- Apply variable replacements (var.tier -> local.tiers.X, renamed vars)
- Fix shared module paths (one fewer ../ at each level)
- Move extra files/dirs (factory/, chart_values, subdirs) to stack root
- Update state files to strip module.<name>. prefix
- Update CLAUDE.md to reflect flat structure

Verified: terragrunt plan shows 0 add, 0 destroy across all stacks.

stacks/f1-stream/module/files/Dockerfile

@@ -1,21 +0,0 @@
-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"]