✨ feat(auth): add centralized @manacore/better-auth-types package

Create new shared package for Better Auth type definitions:
- UserRole, JWTPayload, CurrentUserData types
- Type guards: isValidUserRole, isValidOrganizationRole
- Utility functions: jwtPayloadToCurrentUser
- userAdditionalFields for client type inference

Migrate shared packages to use centralized types:
- @manacore/shared-auth re-exports from new package
- @manacore/shared-nestjs-auth uses new package as dependency

packages/shared-nestjs-auth/src/types/index.ts

@@ -1,12 +1,27 @@
 /**
- * User data extracted from JWT token
+ * NestJS Auth Types
+ *
+ * Re-exports centralized types from @manacore/better-auth-types
+ * plus NestJS-specific configuration interfaces.
  */
-export interface CurrentUserData {
-	userId: string;
-	email: string;
-	role: string;
-	sessionId?: string;
-}
+
+// Re-export centralized types
+export type {
+	CurrentUserData,
+	StrictCurrentUserData,
+	JWTPayload,
+	StrictJWTPayload,
+	UserRole,
+	OrganizationRole,
+	TokenValidationResponse,
+} from '@manacore/better-auth-types';
+
+export {
+	isValidUserRole,
+	isValidOrganizationRole,
+	jwtPayloadToCurrentUser,
+	jwtPayloadToStrictCurrentUser,
+} from '@manacore/better-auth-types';
 
 /**
  * Configuration for the auth module
@@ -19,22 +34,3 @@ export interface AuthModuleConfig {
 	/** Test user ID for development mode */
 	devUserId?: string;
 }
-
-/**
- * Response from token validation endpoint
- */
-export interface TokenValidationResponse {
-	valid: boolean;
-	payload?: {
-		sub: string;
-		email: string;
-		role: string;
-		sessionId?: string;
-		sid?: string;
-		iat?: number;
-		exp?: number;
-		iss?: string;
-		aud?: string;
-	};
-	error?: string;
-}