chore(reset)!: strip storefront → network-service seed (v0.9.0)

Pivot ecomm from a generic multi-tenant Shopify-alternative storefront to the
commitment-commerce + cross-maker verified referral NETWORK direction
(ecomm-content/rfcs/network_strategy.md; OHM identity/relationality super-drafts).

Phase A of the reset — clear the decks:
- Strip the storefront surfaces with no carry-forward: the storefronts domain,
  the products import/export/image HTTP spine (service/imagefetch/repo + endpoints),
  the SPA frontend, and the Playwright e2e suite.
- Keep the reusable core: /healthz + /api/auth/* (accounts); the
  catalog-normalization library (codec/dialect/models/serialize/validate/diff/hosted —
  importable, no HTTP yet); platform/* infra. Migrations untouched (append-only).
- Reduce check.sh to backend-only (import-linter + pytest); trim dev.sh and the unused
  GCS overlay env. Repoint app.json/README/CLAUDE.md; bump VERSION 0.8.0 -> 0.9.0.

check.sh green: import-linter (main > domains > platform) KEPT, pytest passing.

Co-Authored-By: Claude Opus 4.8 (1M context) <noreply@anthropic.com>

.gitea/workflows/ci.yml

@@ -1,8 +1,8 @@
 # Server-side pre-merge gate. Calls the same scripts/check.sh that runs locally, so
 # the local and server gates can never drift: import-linter (main > domains >
-# platform), then backend pytest against a Postgres service, then the frontend
-# typecheck + build. Requires a registered Gitea Actions runner advertising the
-# `ubuntu-latest` label.
+# platform), then backend pytest against a Postgres service. The network-seed reset
+# stripped the SPA frontend, so the gate is backend-only now. Requires a registered
+# Gitea Actions runner advertising the `ubuntu-latest` label.
 name: ci
 
 on:
@@ -35,21 +35,12 @@ jobs:
         with:
           python-version: "3.13"
 
-      - name: Set up Node
-        uses: actions/setup-node@v4
-        with:
-          node-version: "20"
-
       - name: Install backend deps
         run: |
           python -m venv .venv
           .venv/bin/python -m pip install --upgrade pip
           .venv/bin/python -m pip install -r backend/requirements.txt
 
-      - name: Install frontend deps
-        run: |
-          cd frontend && npm ci
-
       - name: Run the pre-merge gate
         env:
           PYTHON: ${{ github.workspace }}/.venv/bin/python