feat: move configuration from .env to DB with Admin UI management

Replace hardcoded .env configuration with database-backed settings
manageable through the Admin web interface. This reduces .env to
bootstrap-only variables (DB, Keycloak, encryption keys).

Backend:
- Add SystemSetting Prisma model with category, valueType, isSecret
- Add system-settings NestJS module (CRUD, 60s cache, encryption)
- Refactor all 7 connectors to lazy-load credentials from DB via
  CredentialsService.findActiveByType() instead of ConfigService
- Add event-driven credential reload (@nestjs/event-emitter)
- Dynamic CORS origins and conditional Swagger from DB settings
- Fix JWT strategy: use Keycloak JWKS (RS256) instead of symmetric secret
- Add SYSTEM_SETTINGS_VIEW/MANAGE permissions
- Seed 13 default settings (sync intervals, features, branding, CORS)
- Add env-to-db migration script (prisma/migrate-env-to-db.ts)

Frontend:
- Add use-credentials hook (full CRUD for integration credentials)
- Add use-system-settings hook (read/update system settings)
- Wire admin-integrations page to real API (create/update/test/toggle)
- Add admin system-settings page with 4 tabs (Branding, CORS, Sync, Features)
- Fix sidebar double-highlighting with exactMatch flag
- Fix integration detail fallback when API unavailable
- Fix API client to unwrap backend's {success, data} envelope
- Update NEXT_PUBLIC_API_URL to include /v1 version prefix
- Fix activity-widget hydration error
- Add i18n keys for systemSettings (de + en)

Co-Authored-By: Claude Opus 4.6 <noreply@anthropic.com>

apps/api/src/modules/integrations/connectors/ecodms/ecodms.module.ts

@@ -1,33 +1,17 @@
 import { Module } from '@nestjs/common';
-import { ConfigModule } from '@nestjs/config';
 import { EcoDmsConnector } from './ecodms.connector';
 import { EcoDmsService } from './ecodms.service';
 import { EcoDmsController } from './ecodms.controller';
+import { CredentialsModule } from '../../credentials/credentials.module';
 
 /**
  * ecoDMS Integration Module
  *
  * Provides integration with ecoDMS document management system.
- *
- * Required environment variables:
- * - ECODMS_API_URL: Base URL of ecoDMS API (e.g., https://ecodms.example.com)
- * - ECODMS_USERNAME: Username for authentication
- * - ECODMS_PASSWORD: Password for authentication
- *
- * Optional environment variables:
- * - ECODMS_API_VERSION: API version (default: v1)
- *
- * Features:
- * - Session-based authentication with automatic refresh
- * - Document CRUD operations
- * - Full-text search with attribute filters
- * - Folder management
- * - Classification/Category management
- * - Document download and preview
- * - OCR support
+ * Credentials are stored in the DB and loaded via CredentialsService.
  */
 @Module({
-  imports: [ConfigModule],
+  imports: [CredentialsModule],
   controllers: [EcoDmsController],
   providers: [EcoDmsConnector, EcoDmsService],
   exports: [EcoDmsService, EcoDmsConnector],