Fix unprotectedURIs typo causing Spring Security 7 startup failure

Spring Security 7 strictly enforces that all URL patterns must start
with '/'. The unprotectedURIs property had 'error.htmla' at the end
which was:
1. Missing the leading '/'
2. Had a typo ('htmla' instead of 'html')

Changed to '/error,/error.html' to properly allow error pages.

🤖 Generated with [Claude Code](https://claude.com/claude-code)

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

Author: devondragon

src/main/resources/application.yml

@@ -117,7 +117,7 @@ user:
     bcryptStrength: 12 # The bcrypt strength to use for password hashing.  The higher the number, the longer it takes to hash the password.  The default is 12.  The minimum is 4.  The maximum is 31.
     testHashTime: true # If true, the test hash time will be logged to the console on startup.  This is useful for determining the optimal bcryptStrength value.
     defaultAction: deny # The default action for all requests.  This can be either deny or allow.
-    unprotectedURIs: /,/index.html,/favicon.ico,/apple-touch-icon-precomposed.png,/css/*,/js/*,/js/user/*,/js/event/*,/img/**,/user/registration,/user/resendRegistrationToken,/user/resetPassword,/user/registrationConfirm,/user/changePassword,/user/savePassword,/oauth2/authorization/*,/login,/user/login,/user/login.html,/swagger-ui.html,/swagger-ui/**,/v3/api-docs/**,/event/,/event/list.html,/event/**,/about.html,error.htmla # A comma delimited list of URIs that should not be protected by Spring Security if the defaultAction is deny.
+    unprotectedURIs: /,/index.html,/favicon.ico,/apple-touch-icon-precomposed.png,/css/*,/js/*,/js/user/*,/js/event/*,/img/**,/user/registration,/user/resendRegistrationToken,/user/resetPassword,/user/registrationConfirm,/user/changePassword,/user/savePassword,/oauth2/authorization/*,/login,/user/login,/user/login.html,/swagger-ui.html,/swagger-ui/**,/v3/api-docs/**,/event/,/event/list.html,/event/**,/about.html,/error,/error.html # A comma delimited list of URIs that should not be protected by Spring Security if the defaultAction is deny.
     protectedURIs: /protected.html # A comma delimited list of URIs that should be protected by Spring Security if the defaultAction is allow.
     disableCSRFdURIs: /no-csrf-test # A comma delimited list of URIs that should not be protected by CSRF protection. This may include API endpoints that need to be called without a CSRF token.