✅ fix(mana-core-auth): complete production readiness with test fixes

- Fix LoggerService mock in better-auth.service.spec.ts
- Fix name assertion in auth.controller.spec.ts (empty string fallback)
- Fix createRemoteJWKSet mock in jwt-auth.guard.spec.ts
- Add Grafana dashboard for Auth Service monitoring
- Add 10 auth-specific Prometheus alert rules
- Update production readiness plan to 100% complete

All 199 unit tests passing.

Co-Authored-By: Claude Opus 4.5 <noreply@anthropic.com>

services/mana-core-auth/src/auth/auth.controller.spec.ts

@@ -139,7 +139,8 @@ describe('AuthController', () => {
 			expect(betterAuthService.registerB2C).toHaveBeenCalledWith({
 				email: registerDto.email,
 				password: registerDto.password,
-				name: undefined, // Controller passes undefined when name is not provided
+				name: '', // Controller passes empty string as fallback when name is not provided
+				sourceAppUrl: undefined,
 			});
 		});