refactor: replace long arg lists with input/config structs and builder

- Thought::new_local → NewThought struct (7 args → 1)
- UserWriter::update_profile → UpdateProfileInput struct (6 args → 2)
- update_profile use case → UpdateProfileInput (8 args → 3)
- ActivityPubService::new → builder pattern (9 args → 5 required + 4 optional setters)
- accept_note → AcceptNoteInput struct (8 args → 1)
- ThoughtNote::new_public → ThoughtNoteInput struct (8 args → 1)

Remove all #[allow(clippy::too_many_arguments)] annotations.

crates/adapters/postgres/src/test_helpers.rs

@@ -1,7 +1,7 @@
 use crate::{thought::PgThoughtRepository, user::PgUserRepository};
 use domain::{
     models::{
-        thought::{Thought, Visibility},
+        thought::{NewThought, Thought, Visibility},
         user::User,
     },
     ports::{ThoughtRepository, UserWriter},
@@ -23,15 +23,15 @@ pub async fn seed_user(pool: &sqlx::PgPool, username: &str, email: &str) -> User
 pub async fn seed_user_and_thought(pool: &sqlx::PgPool) -> (User, Thought) {
     let user = seed_user(pool, "alice", "alice@ex.com").await;
     let trepo = PgThoughtRepository::new(pool.clone());
-    let t = Thought::new_local(
-        ThoughtId::new(),
-        user.id.clone(),
-        Content::new_local("hi").unwrap(),
-        None,
-        Visibility::Public,
-        None,
-        false,
-    );
+    let t = Thought::new_local(NewThought {
+        id: ThoughtId::new(),
+        user_id: user.id.clone(),
+        content: Content::new_local("hi").unwrap(),
+        in_reply_to_id: None,
+        visibility: Visibility::Public,
+        content_warning: None,
+        sensitive: false,
+    });
     trepo.save(&t).await.unwrap();
     (user, t)
 }