Rename Forte to LunarFront, generalize for any small business

Rebrand from Forte (music-store-specific) to LunarFront (any small business):
- Package namespace @forte/* → @lunarfront/*
- Database forte/forte_test → lunarfront/lunarfront_test
- Docker containers, volumes, connection strings
- UI branding, localStorage keys, test emails
- All documentation and planning docs

Generalize music-specific terminology:
- instrumentDescription → itemDescription
- instrumentCount → itemCount
- instrumentType → itemCategory (on service templates)
- New migration 0027_generalize_terminology for column renames
- Seed data updated with generic examples
- RBAC descriptions updated

docs/testing.md

@@ -4,7 +4,7 @@
 
 The primary test suite lives at `packages/backend/api-tests/`. It uses a custom runner that:
 
-1. Creates/migrates a `forte_api_test` database
+1. Creates/migrates a `lunarfront_api_test` database
 2. Seeds company, lookup tables, RBAC permissions/roles
 3. Starts the backend on port 8001
 4. Registers a test user with admin role