remove datasets and products modules, reset migrations

[antosubash]

Summary

• Removes the datasets and products example modules from the workspace, along with all host/CLI/dashboard wiring and the integration + e2e tests that used products as their CRUD subject.
• Resets host/migrations/versions/ — every existing migration is deleted and replaced by a single autogenerated 77162e7b184b_initial_schema.py covering the remaining 8 modules.
• Dashboard's home page loses the product-count tile (4-tile grid → 3-tile) and the workspace dep on simple_module_products.

Why

datasets and products were demo modules whose names collide with custom modules users typically register themselves. Removing them simplifies the default surface and eliminates frozen migrations referencing modules that no longer exist.

What changed

Deleted

• modules/datasets/, modules/products/ (full packages)
• tests/integration/test_products_journey.py, test_inertia_views.py, test_permission_boundaries.py, test_soft_delete_api.py
• tests/e2e/test_smoke.py, tests/loadtest/locustfile.py
• All previous files under host/migrations/versions/ (replaced by one fresh migration)

Wiring

• host/pyproject.toml, root pyproject.toml — drop simple_module_datasets / simple_module_products deps + workspace entries + ty extra-paths + pytest testpaths.
• framework/cli/simple_module_cli/catalog.py — remove datasets and products from CATALOG, drop now-empty _EXAMPLE_MODULES, drop the examples preset, change dashboard.requires from ("users", "products") to ("users",).
• framework/cli/simple_module_cli/new.py — drop Preset.examples.

Dashboard

• Drop product workspace dep, Products from depends_on, _count_products + total_products from stats.py, products tile + Package icon + unused primary accent from Home.tsx, stats.products key from en.json/es.json.

Tests adapted

• framework/db/tests/test_db_logging.py — drop TestEntityListenerLogging (used products.models.Product).
• framework/db/tests/test_migrations.py — assertion now checks for a user table instead of a product one.
• framework/hosting/tests/test_app.py — drop products route + permission tests.
• framework/cli/tests/test_scaffolding_host.py — uses Dashboard/Auth instead of Products/Auth.
• framework/cli/tests/test_cli_catalog.py, test_cli_wizard.py — adjusted for new catalog shape.
• framework/core/tests/test_discovery.py — replaced Products assertions with Users.
• modules/feature_flags/tests/ — products.bulk_import → file_storage.public_uploads (the same registry behavior, but registered by file_storage instead of products).
• tests/integration/conftest.py — drop create_product factory.

Docs

• README.md, docs/release.md, docs/guide/quickstart.md, docs/guide/project-structure.md, docs/e2e-testing.md updated.

Reviewer notes

• Migration reset is destructive for existing deployments. Anyone with an existing DB needs to recreate it (or hand-stamp 77162e7b184b) — there's no upgrade path from the prior multi-revision graph to this single one.
• The e3ce9754e6dc_seed_users_roles.py data migration is gone, but the users module already seeds the admin/user roles via bootstrap.py and on_startup, so a fresh boot still ends up with the same role rows.
• Many remaining test files mention "products" or "Products" — those are deliberate: they're generic permission-key strings (products.view), placeholder fixture names in unit tests, or doc/comment examples. None imports the products module.

Test plan

• uv sync --all-packages
• make test — 943 passed, 0 failed, 2 deselected (e2e marker)
• make test-js — 8 passed
• make lint — ruff format/check, ty, biome, all per-workspace tsc, file-size cap, hardcoded-strings, metadata, READMEs all clean
• make doctor (python -m simple_module_core) — exit 0
• alembic upgrade head on fresh sqlite DB → applies cleanly to revision 77162e7b184b
• alembic check → "No new upgrade operations detected"
• Host boots: 8 modules discovered, /health reports is_current: true, /openapi.json shows no /api/products/* routes