feat: implement admin and OIDC authentication methods; add login and user info endpoints

Signed-off-by: Noste <83548733+Noooste@users.noreply.github.com>

config.yaml.example

@@ -5,6 +5,9 @@ server:
   host: "0.0.0.0"
   port: 8080
   environment: "development" # development, production
+  domain: "localhost" # Domain name for the application
+  protocol: "http" # Protocol for internal communication (http/https)
+  root_url: "http://localhost:8080" # Full external URL for OAuth2 redirects (adjust for production)
 
 # Garage S3 Configuration
 garage:
@@ -16,18 +19,19 @@ garage:
   admin_token: "changeme" # Admin API bearer token
 
 # Authentication Configuration
+# You can enable one or both authentication methods
 auth:
-  # Auth mode: "none", "basic", or "oidc"
-  mode: "none"
-
-  # Basic Authentication (only used when mode = "basic")
-  basic:
+  # Admin Authentication (username/password)
+  admin:
+    enabled: false # Set to true to enable admin login
     username: "admin"
     password: "changeme"
 
-  # OIDC Configuration (only used when mode = "oidc")
+  # OIDC Configuration
+  # NOTE: When OIDC is enabled, server.root_url is required for OAuth2 redirects
+  # The redirect URL will be automatically constructed as: {root_url}/auth/oidc/callback
   oidc:
-    enabled: true
+    enabled: false # Set to true to enable OIDC login
     provider_name: "Keycloak"
     client_id: "garage-ui"
     client_secret: "your-client-secret"