refactor(meadows): rename products to meadows

Summary

• Renames the Products data model to Meadows end to end to reflect that each record represents a domain boundary rather than a product. Module namespace Hive.Products.* becomes Hive.Meadows.*; schemas, controllers, and LiveViews follow (Product → Meadow, ProductRepository → MeadowRepository, ProductWebhookController → MeadowWebhookController, SettingsLive.Product(s) → SettingsLive.Meadow(s)).
• Updates routes: /settings/products[/:id] → /settings/meadows[/:id]; /webhooks/products/:product_id/... → /webhooks/meadows/:meadow_id/....
• Adds a new migration (20260611000001_rename_products_to_meadows.exs) that renames the 4 tables, the product_id columns, primary keys, indexes, and the visibility check constraint. Historical migrations are left untouched.
• Updates AGENTS.md/CLAUDE.md and the VitePress docs site (tagline + per-meadow scoping copy) to use meadow terminology. Marketing prose that uses “product” generically (e.g. “product teams”, “shape of product work”) is intentionally left alone. The Hive instance branding surface (Auth.product_name, @product_name assign) is preserved since it is unrelated to the data model.

Testing

• mix compile --warnings-as-errors
• MIX_ENV=test mix ecto.drop && mix ecto.create && mix ecto.migrate
• mix test (306 tests, 0 failures)

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