feat(webapp): add compute migration feature flags

Author: nicktrn

apps/webapp/app/v3/featureFlags.ts

@@ -11,6 +11,9 @@ export const FEATURE_FLAG = {
   mollifierEnabled: "mollifierEnabled",
   workerQueueScheduledSplitEnabled: "workerQueueScheduledSplitEnabled",
   realtimeBackend: "realtimeBackend",
+  computeMigrationEnabled: "computeMigrationEnabled",
+  computeMigrationFreePercentage: "computeMigrationFreePercentage",
+  computeMigrationPaidPercentage: "computeMigrationPaidPercentage",
 } as const;
 
 export const FeatureFlagCatalog = {
@@ -27,6 +30,9 @@ export const FeatureFlagCatalog = {
   // globally and per-org (org wins). Defaults to "electric" when unset.
   // "shadow" serves Electric but diffs the native path in the background.
   [FEATURE_FLAG.realtimeBackend]: z.enum(["electric", "native", "shadow"]),
+  [FEATURE_FLAG.computeMigrationEnabled]: z.coerce.boolean(),
+  [FEATURE_FLAG.computeMigrationFreePercentage]: z.coerce.number().int().min(0).max(100),
+  [FEATURE_FLAG.computeMigrationPaidPercentage]: z.coerce.number().int().min(0).max(100),
 };
 
 export type FeatureFlagKey = keyof typeof FeatureFlagCatalog;