refactor: consolidate 11 social use cases → SocialCmd/SocialQry enum dispatch

-280 net lines. 11 one-file use cases replaced by execute_command/
execute_query with enum dispatch. Added FollowRejected event (reject
was silently dropping). Command→event mapping now explicit in one match.

crates/application/src/social/execute.rs

@@ -0,0 +1,101 @@
+use domain::{
+    errors::DomainError,
+    events::DomainEvent,
+    value_objects::{SocialActor, UserId},
+};
+
+use super::{
+    commands::SocialCmd,
+    deps::{SocialCommandDeps, SocialQueryDeps},
+    queries::SocialQry,
+};
+
+pub async fn execute_command(
+    deps: &SocialCommandDeps,
+    cmd: SocialCmd,
+) -> Result<(), DomainError> {
+    let event = match cmd {
+        SocialCmd::Follow {
+            follower_id,
+            target,
+        } => {
+            let follower = UserId::from_uuid(follower_id);
+            deps.social_command.follow(&follower, &target).await?;
+            DomainEvent::FollowRequested { follower, target }
+        }
+        SocialCmd::Unfollow {
+            follower_id,
+            target,
+        } => {
+            let follower = UserId::from_uuid(follower_id);
+            deps.social_command.unfollow(&follower, &target).await?;
+            DomainEvent::Unfollowed { follower, target }
+        }
+        SocialCmd::AcceptFollow {
+            owner_id,
+            requester,
+        } => {
+            let owner = UserId::from_uuid(owner_id);
+            deps.social_command
+                .accept_follow(&owner, &requester)
+                .await?;
+            DomainEvent::FollowAccepted { owner, requester }
+        }
+        SocialCmd::RejectFollow {
+            owner_id,
+            requester,
+        } => {
+            let owner = UserId::from_uuid(owner_id);
+            deps.social_command
+                .reject_follow(&owner, &requester)
+                .await?;
+            DomainEvent::FollowRejected { owner, requester }
+        }
+        SocialCmd::RemoveFollower { owner_id, follower } => {
+            let owner = UserId::from_uuid(owner_id);
+            deps.social_command
+                .remove_follower(&owner, &follower)
+                .await?;
+            DomainEvent::FollowerRemoved { owner, follower }
+        }
+        SocialCmd::Block {
+            blocker_id,
+            target,
+        } => {
+            let blocker = UserId::from_uuid(blocker_id);
+            deps.social_command.block(&blocker, &target).await?;
+            DomainEvent::ActorBlocked { blocker, target }
+        }
+        SocialCmd::Unblock {
+            blocker_id,
+            target,
+        } => {
+            let blocker = UserId::from_uuid(blocker_id);
+            deps.social_command.unblock(&blocker, &target).await?;
+            DomainEvent::ActorUnblocked { blocker, target }
+        }
+    };
+    deps.event_publisher.publish(&event).await
+}
+
+pub async fn execute_query(
+    deps: &SocialQueryDeps,
+    query: SocialQry,
+) -> Result<Vec<SocialActor>, DomainError> {
+    let user_id = match &query {
+        SocialQry::GetFollowing { user_id }
+        | SocialQry::GetFollowers { user_id }
+        | SocialQry::GetPending { user_id }
+        | SocialQry::GetBlocked { user_id } => UserId::from_uuid(*user_id),
+    };
+    match query {
+        SocialQry::GetFollowing { .. } => deps.social_query.get_following(&user_id).await,
+        SocialQry::GetFollowers { .. } => deps.social_query.get_followers(&user_id).await,
+        SocialQry::GetPending { .. } => deps.social_query.get_pending_followers(&user_id).await,
+        SocialQry::GetBlocked { .. } => deps.social_query.get_blocked(&user_id).await,
+    }
+}
+
+#[cfg(test)]
+#[path = "tests/execute.rs"]
+mod tests;