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/vault.ts

@@ -96,14 +96,14 @@ suite('Vault', { tags: ['vault'] }, (t) => {
 
     const res = await t.api.post(`/v1/vault/categories/${catId}/entries`, {
       name: 'Store WiFi',
-      username: 'ForteMusic',
+      username: 'DemoUser',
       url: 'http://192.168.1.1',
       notes: 'Router admin panel',
       secret: 'supersecretpassword123',
     })
     t.assert.status(res, 201)
     t.assert.equal(res.data.name, 'Store WiFi')
-    t.assert.equal(res.data.username, 'ForteMusic')
+    t.assert.equal(res.data.username, 'DemoUser')
     t.assert.equal(res.data.hasSecret, true)
     // Secret value should NOT be in the response
     t.assert.falsy(res.data.encryptedValue)