activity-pub implementation

crates/adapters/sqlite/migrations/0003_activitypub.sql

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+ALTER TABLE reviews ADD COLUMN remote_actor_url TEXT;
+CREATE TABLE ap_followers (
+    local_user_id TEXT NOT NULL REFERENCES users(id) ON DELETE CASCADE,
+    remote_actor_url TEXT NOT NULL,
+    status TEXT NOT NULL DEFAULT 'pending',
+    created_at TEXT NOT NULL,
+    PRIMARY KEY (local_user_id, remote_actor_url)
+);
+CREATE TABLE ap_following (
+    local_user_id TEXT NOT NULL REFERENCES users(id) ON DELETE CASCADE,
+    remote_actor_url TEXT NOT NULL,
+    created_at TEXT NOT NULL,
+    PRIMARY KEY (local_user_id, remote_actor_url)
+);
+CREATE TABLE ap_remote_actors (
+    url TEXT PRIMARY KEY,
+    handle TEXT NOT NULL,
+    inbox_url TEXT NOT NULL,
+    shared_inbox_url TEXT,
+    display_name TEXT,
+    fetched_at TEXT NOT NULL
+);
+CREATE TABLE IF NOT EXISTS ap_local_actors (
+    user_id TEXT PRIMARY KEY REFERENCES users(id) ON DELETE CASCADE,
+    public_key TEXT NOT NULL,
+    private_key TEXT NOT NULL,
+    created_at TEXT NOT NULL
+);