Use shared AP blueprint, drop custom wellknown/actors BPs

Webfinger, actor profile, inbox, outbox, and followers are now served
by the shared AP blueprint registered in create_base_app(). Federation
keeps identity + social blueprints for UI routes.

Co-Authored-By: Claude Opus 4.6 <noreply@anthropic.com>

bp/__init__.py

@@ -1,4 +1,2 @@
-from .wellknown.routes import register as register_wellknown_bp
-from .actors.routes import register as register_actors_bp
 from .identity.routes import register as register_identity_bp
 from .social.routes import register as register_social_bp