feat: add POST /federation/me/move endpoint

crates/adapters/activitypub/src/service.rs

@@ -736,6 +736,17 @@ impl FederationFollowPort for ApFederationAdapter {
             .map(|v| v.into_iter().map(k_ap_actor_to_domain).collect())
             .map_err(|e| DomainError::ExternalService(e.to_string()))
     }
+
+    async fn broadcast_move(
+        &self,
+        user_id: &UserId,
+        new_actor_url: url::Url,
+    ) -> Result<(), DomainError> {
+        self.inner
+            .broadcast_move(user_id.as_uuid(), new_actor_url)
+            .await
+            .map_err(|e| DomainError::Internal(e.to_string()))
+    }
 }
 
 // ── FederationFollowRequestPort ───────────────────────────────────────────────

crates/domain/src/ports.rs

@@ -287,6 +287,11 @@ pub trait FederationFollowPort: Send + Sync {
     ) -> Result<(), DomainError>;
     async fn get_remote_following(&self, user_id: &UserId)
         -> Result<Vec<RemoteActor>, DomainError>;
+    async fn broadcast_move(
+        &self,
+        user_id: &UserId,
+        new_actor_url: url::Url,
+    ) -> Result<(), DomainError>;
 }
 
 #[async_trait]

crates/presentation/src/handlers/federation_management.rs

@@ -22,6 +22,11 @@ pub struct HandleBody {
     pub handle: String,
 }
 
+#[derive(Deserialize)]
+pub struct MoveBody {
+    pub new_actor_url: String,
+}
+
 deps_struct!(FederationManagementDeps {
     federation: FederationActionPort,
     follows: FollowRepository,
@@ -107,3 +112,17 @@ pub async fn delete_following(
     .await?;
     Ok(StatusCode::NO_CONTENT)
 }
+
+pub async fn post_move_account(
+    Deps(d): Deps<FederationManagementDeps>,
+    AuthUser(uid): AuthUser,
+    Json(body): Json<MoveBody>,
+) -> Result<StatusCode, ApiError> {
+    let new_url = url::Url::parse(&body.new_actor_url)
+        .map_err(|_| ApiError::BadRequest("invalid new_actor_url".into()))?;
+    d.federation
+        .broadcast_move(&uid, new_url)
+        .await
+        .map_err(ApiError::from)?;
+    Ok(StatusCode::NO_CONTENT)
+}

crates/presentation/src/routes.rs

@@ -104,6 +104,10 @@ pub fn router() -> Router<AppState> {
             get(federation_management::get_remote_following)
                 .delete(federation_management::delete_following),
         )
+        .route(
+            "/federation/me/move",
+            post(federation_management::post_move_account),
+        )
         .route("/tags/popular", get(feed::get_popular_tags))
         .route("/tags/{name}", get(feed::tag_thoughts_handler))
         // notifications