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/src/db/migrations/meta/_journal.json

@@ -190,6 +190,13 @@
       "when": 1774860000000,
       "tag": "0026_modules",
       "breakpoints": true
+    },
+    {
+      "idx": 27,
+      "version": "7",
+      "when": 1774870000000,
+      "tag": "0027_generalize_terminology",
+      "breakpoints": true
     }
   ]
 }