feat(billingplan): Add Paddle v2 checkout support and backend config endpoint; add CSP headers and bump typedserver

ts/reception/classes.billingplanmanager.ts

@@ -59,6 +59,17 @@ export class BillingPlanManager {
           }
         }
       }
-    }))
+    }));
+
+    // Paddle configuration endpoint
+    this.typedrouter.addTypedHandler(
+      new plugins.typedrequest.TypedHandler<plugins.idpInterfaces.request.IReq_GetPaddleConfig>(
+        'getPaddleConfig',
+        async () => ({
+          paddleToken: await this.receptionRef.serviceQenv.getEnvVarOnDemand('PADDLE_TOKEN'),
+          paddlePriceId: await this.receptionRef.serviceQenv.getEnvVarOnDemand('PADDLE_PRICE_ID'),
+        })
+      )
+    );
   }
 }