test: move http-axum tests to tests/

Drop bootstrap dev-dep. Extractor + api handler + app-context tests (need full AppState via build_deps) -> bootstrap/tests/http_handlers/. forms tests -> http-axum/tests/log_review_form_test.rs.
Federation collection tests now go through public federation::html_routes().
Kept inline (private fns): api/social social_actor_to_dto (4), federation/blocklist_api social_actor_to_blocked_dto (1), html/social social_actor_to_template (1), router slow_down/api_governor (2).

crates/adapters/http-axum/src/extractors/mod.rs

@@ -156,6 +156,3 @@ where
         }
     }
 }
-
-#[cfg(test)]
-pub(crate) mod tests;