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/application/src/testing.rs

@@ -95,14 +95,7 @@ impl ActivityPubRepository for TestApRepo {
     }
     async fn accept_note(
         &self,
-        _ap_id: &str,
-        _author_id: &UserId,
-        _content: &str,
-        _published: chrono::DateTime<chrono::Utc>,
-        _sensitive: bool,
-        _content_warning: Option<String>,
-        _visibility: &str,
-        _in_reply_to: Option<&str>,
+        _input: activitypub_base::AcceptNoteInput<'_>,
     ) -> Result<ThoughtId, DomainError> {
         Ok(ThoughtId::from_uuid(uuid::Uuid::new_v4()))
     }