feat(home): add compact home page preset to avoid abuse classification

- Add compact_home_enabled setting to provide a minimal landing page
- Preserves custom home_content priority over compact mode
- Renders only site identity, navigation, and login/dashboard link
- Avoids marketing copy that triggers anti-fraud systems
- Includes focused backend/frontend tests and i18n support

Fixes #5065

frontend/src/stores/__tests__/app.spec.ts

@@ -33,6 +33,7 @@ function createPublicSettings(overrides: Partial<PublicSettings> = {}): PublicSe
     contact_info: '',
     doc_url: '',
     home_content: '',
+    compact_home_enabled: false,
     hide_ccs_import_button: false,
     payment_enabled: false,
     risk_control_enabled: false,
@@ -452,6 +453,7 @@ describe('useAppStore', () => {
         contact_info: '',
         doc_url: '',
         home_content: '',
+        compact_home_enabled: false,
         hide_ccs_import_button: false,
         purchase_subscription_enabled: false,
         purchase_subscription_url: '',

frontend/src/stores/app.ts

@@ -342,6 +342,7 @@ export const useAppStore = defineStore('app', () => {
         contact_info: contactInfo.value,
         doc_url: docUrl.value,
         home_content: '',
+        compact_home_enabled: false,
         hide_ccs_import_button: false,
         payment_enabled: false,
         table_default_page_size: 20,