Add OAuth2/OpenID Connect authorization server

Implement a full OAuth2 2.0 and OpenID Connect 1.0 authorization
server with support for authorization code flow (with PKCE),
refresh token rotation, device authorization grant, dynamic
client registration, token introspection, and token revocation.

Includes database schema, coredata layer, service logic, HTTP
handlers, OIDC discovery endpoint, and JWKS publishing.

Signed-off-by: Bryan Frimin <bryan@getprobo.com>

pkg/server/api/connect/v1/graphql/oauth2.graphql

@@ -0,0 +1,42 @@
+extend type Mutation {
+    authorizeDevice(
+        input: AuthorizeDeviceInput!
+    ): AuthorizeDevicePayload @session(required: PRESENT)
+
+  approveConsent(
+    input: ApproveConsentInput!
+  ): ApproveConsentPayload @session(required: PRESENT)
+}
+
+
+input AuthorizeDeviceInput {
+  userCode: String!
+}
+
+type AuthorizeDevicePayload {
+  success: Boolean!
+  consentId: ID
+}
+
+type Consent implements Node {
+  id: ID!
+  application: Application! @goField(forceResolver: true)
+  scopes: [String!]!
+}
+
+type Application implements Node {
+  id: ID!
+  name: String!
+  logoUrl: String
+  url: String
+}
+
+input ApproveConsentInput {
+  consentId: ID!
+  approved: Boolean!
+}
+
+type ApproveConsentPayload {
+  redirectURL: String
+  deviceAuthorized: Boolean
+}