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>

backend/tests/test_bootstrap.py

@@ -1,6 +1,7 @@
 """INV-1's enforcement (SD-0001 §6.8): from an empty database, one test walks the whole
-flow — request-code -> verify -> create-storefront -> /me — asserting no step needed
-seeded state. Migration idempotence (the second INV-1 test) lives in test_migrations.py."""
+surviving flow — request-code -> verify -> /me — asserting no step needed seeded state.
+The network-seed reset removed the create-storefront step from this flow. Migration
+idempotence (the second INV-1 test) lives in test_migrations.py."""
 import re
 
 from fastapi.testclient import TestClient
@@ -26,17 +27,9 @@ def test_inv_1_bootstrap_whole_flow_from_empty(fresh_db_url):
         )
         assert verified.status_code == 200
         assert verified.json()["created"] is True
-        assert verified.json()["storefront"] is None  # -> create-storefront (PUC-5)
+        assert verified.json()["account"] == {"email": "first@example.com"}
 
-        # PUC-4: create the storefront (blank name -> generated default)
-        created = client.post("/api/storefronts", json={})
-        assert created.status_code == 201
-        assert created.json()["name"] == "first's storefront"
-
-        # PUC-6/PUC-8: the admin answer — storefront + email from /me alone
+        # the admin answer — the signed-in account from /me alone (cookie set by verify)
         me = client.get("/api/auth/me")
         assert me.status_code == 200
-        assert me.json() == {
-            "account": {"email": "first@example.com"},
-            "storefront": created.json(),
-        }
+        assert me.json() == {"account": {"email": "first@example.com"}}