feat: v2 rewrite — hexagonal arch, ActivityPub federation, NATS, deployment-ready (#1)

crates/adapters/postgres/migrations/006_remote_actor_connections.sql

@@ -0,0 +1,13 @@
+CREATE TABLE remote_actor_connections (
+    id                     UUID        PRIMARY KEY DEFAULT gen_random_uuid(),
+    actor_url              TEXT        NOT NULL,
+    connection_type        TEXT        NOT NULL,
+    page                   INT         NOT NULL,
+    connected_actor_url    TEXT        NOT NULL,
+    connected_handle       TEXT        NOT NULL,
+    connected_display_name TEXT,
+    connected_avatar_url   TEXT,
+    fetched_at             TIMESTAMPTZ NOT NULL DEFAULT NOW(),
+    UNIQUE(actor_url, connection_type, page, connected_actor_url)
+);
+CREATE INDEX ON remote_actor_connections(actor_url, connection_type, page, fetched_at);