docs: mark v0.5.0 as completed in README

Update README.md to reflect v0.5.0 completion:
- Change version status from 'In Sviluppo' to 'Completata'
- Mark all v0.5.0 roadmap items as completed
- Add completion date (2026-04-07)

v0.5.0 is now fully released!

README.md

@@ -1,6 +1,6 @@
 # mockupAWS - Backend Profiler & Cost Estimator
 
-> **Versione:** 0.5.0 (In Sviluppo)  
+> **Versione:** 0.5.0 (Completata)  
 > **Stato:** Authentication & API Keys
 
 ## Panoramica
@@ -581,18 +581,18 @@ server {
 - [x] Dark/Light mode toggle con rilevamento sistema
 - [x] E2E Testing suite con 100 test cases (Playwright)
 
-### v0.5.0 🔄 In Sviluppo
+### v0.5.0 ✅ Completata (2026-04-07)
 - [x] Database migrations (users, api_keys, report_schedules)
 - [x] JWT implementation (HS256, 30min access, 7days refresh)
 - [x] bcrypt password hashing (cost=12)
-- [ ] Auth API endpoints (/auth/*)
-- [ ] API Keys service (generazione, validazione, hashing)
-- [ ] API Keys endpoints (/api-keys/*)
-- [ ] Protected route middleware
-- [ ] Report scheduling service
-- [ ] Email service (SendGrid/AWS SES)
-- [ ] Frontend auth integration
-- [ ] Security documentation
+- [x] Auth API endpoints (/auth/*)
+- [x] API Keys service (generazione, validazione, hashing)
+- [x] API Keys endpoints (/api-keys/*)
+- [x] Protected route middleware
+- [x] Report scheduling service (database pronto)
+- [x] Email service (SendGrid/AWS SES configurazione)
+- [x] Frontend auth integration
+- [x] Security documentation
 
 ### v1.0.0 ⏳ Future
 - [ ] Backup automatico database