✨ feat(admin): add user data dashboard for cross-project data visualization

Add comprehensive admin dashboard to view and manage user data across all projects:

Backend:
- Add admin endpoints to Chat, Todo, Contacts, Calendar, Picture, Zitare, Presi
- Each backend exposes GET/DELETE /api/v1/admin/user-data/:userId
- Service-to-service auth via X-Service-Key header

Aggregation (mana-core-auth):
- GET /api/v1/admin/users - Paginated user list with search
- GET /api/v1/admin/users/:userId/data - Aggregated data from all backends
- DELETE /api/v1/admin/users/:userId/data - GDPR deletion across all projects

Frontend (ManaCore web):
- New User Data tab in admin navigation
- User search page at /admin/user-data
- User detail page with ProjectDataCard components
- GDPR deletion dialog with email confirmation

Presi:
- Migrate user_id from UUID to TEXT for Better Auth compatibility
- Add SQL migration script

services/mana-core-auth/package.json

@@ -25,6 +25,7 @@
 	},
 	"dependencies": {
 		"@google/generative-ai": "^0.24.1",
+		"@nestjs/axios": "^4.0.1",
 		"@nestjs/common": "^10.4.15",
 		"@nestjs/config": "^3.3.0",
 		"@nestjs/core": "^10.4.15",
@@ -32,6 +33,7 @@
 		"@nestjs/schedule": "^4.1.2",
 		"@nestjs/swagger": "^8.1.0",
 		"@nestjs/throttler": "^6.2.1",
+		"axios": "^1.7.2",
 		"bcrypt": "^5.1.1",
 		"better-auth": "^1.4.3",
 		"body-parser": "^2.2.2",
@@ -65,8 +67,8 @@
 		"@types/cookie-parser": "^1.4.7",
 		"@types/express": "^5.0.0",
 		"@types/jest": "^29.5.14",
-		"@types/node": "^22.10.2",
 		"@types/jsonwebtoken": "^9.0.9",
+		"@types/node": "^22.10.2",
 		"@types/nodemailer": "^7.0.5",
 		"@types/supertest": "^6.0.2",
 		"@typescript-eslint/eslint-plugin": "^8.18.2",