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

packages/backend/api-tests/suites/rbac.ts

@@ -304,7 +304,7 @@ suite('RBAC', { tags: ['rbac', 'permissions'] }, (t) => {
   t.test('cannot disable yourself', { tags: ['users', 'status'] }, async () => {
     // Get current user ID from the users list
     const usersRes = await t.api.get('/v1/users')
-    const currentUser = usersRes.data.data.find((u: { email: string }) => u.email === 'test@forte.dev')
+    const currentUser = usersRes.data.data.find((u: { email: string }) => u.email === 'test@lunarfront.dev')
     t.assert.ok(currentUser)
 
     const res = await t.api.patch(`/v1/users/${currentUser.id}/status`, { isActive: false })