feat: add aiModerated flag to moderateSourcePosts mutation

Add an optional `aiModerated` Boolean parameter to the `moderateSourcePosts`
GraphQL mutation. When set to `true`, the mutation merges
`{ aiModerated: true }` into the JSONB `flags` column of the moderated posts.

This enables traceability for AI-automated moderation decisions vs human ones,
used by the squad-moderation automation agent.

Changes:
- Add `aiModerated` to `SourcePostModerationFlags` type
- Add `aiModerated: Boolean` parameter to GraphQL schema
- Merge flag into JSONB using existing `updateFlagsStatement` utility

Author: pnvasanth

src/entity/SourcePostModeration.ts

@@ -52,6 +52,7 @@ export enum WarningReason {
 }
 
 export type SourcePostModerationFlags = Partial<{
+  aiModerated: boolean;
   vordr: boolean;
   warningReason: WarningReason;
   dedupKey: string;

src/schema/posts.ts

@@ -1744,6 +1744,10 @@ export const typeDefs = /* GraphQL */ `
       Moderator message for the post
       """
       moderatorMessage: String
+      """
+      Whether this moderation decision was made by AI
+      """
+      aiModerated: Boolean
     ): [SourcePostModeration]! @auth
 
     """
@@ -3120,12 +3124,13 @@ export const resolvers: IResolvers<unknown, BaseContext> = {
         status,
         rejectionReason = null,
         moderatorMessage = null,
+        aiModerated = false,
       }: {
         postIds: string[];
       } & Pick<
         SourcePostModeration,
         'sourceId' | 'status' | 'rejectionReason' | 'moderatorMessage'
-      >,
+      > & { aiModerated?: boolean },
       ctx: AuthContext,
       info,
     ) => {
@@ -3177,6 +3182,13 @@ export const resolvers: IResolvers<unknown, BaseContext> = {
         update.moderatorMessage = moderatorMessage;
       }
 
+      if (aiModerated) {
+        (update as Record<string, unknown>).flags =
+          updateFlagsStatement<SourcePostModeration>({
+            aiModerated: true,
+          });
+      }
+
       await ctx.con
         .getRepository(SourcePostModeration)
         .update(