feat(postgres): initial migrations

crates/adapters/postgres/migrations/002_federation_columns.sql

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+ALTER TABLE users
+    ADD COLUMN IF NOT EXISTS ap_id        TEXT UNIQUE,
+    ADD COLUMN IF NOT EXISTS inbox_url    TEXT,
+    ADD COLUMN IF NOT EXISTS public_key   TEXT,
+    ADD COLUMN IF NOT EXISTS private_key  TEXT,
+    ADD COLUMN IF NOT EXISTS local        BOOLEAN NOT NULL DEFAULT true;
+
+ALTER TABLE thoughts
+    ADD COLUMN IF NOT EXISTS in_reply_to_id  UUID REFERENCES thoughts(id),
+    ADD COLUMN IF NOT EXISTS in_reply_to_url TEXT,
+    ADD COLUMN IF NOT EXISTS ap_id           TEXT UNIQUE,
+    ADD COLUMN IF NOT EXISTS visibility      TEXT NOT NULL DEFAULT 'public',
+    ADD COLUMN IF NOT EXISTS content_warning TEXT,
+    ADD COLUMN IF NOT EXISTS sensitive       BOOLEAN NOT NULL DEFAULT false,
+    ADD COLUMN IF NOT EXISTS local           BOOLEAN NOT NULL DEFAULT true,
+    ADD COLUMN IF NOT EXISTS updated_at      TIMESTAMPTZ;
+
+ALTER TABLE follows
+    ADD COLUMN IF NOT EXISTS state      TEXT        NOT NULL DEFAULT 'accepted',
+    ADD COLUMN IF NOT EXISTS ap_id      TEXT,
+    ADD COLUMN IF NOT EXISTS created_at TIMESTAMPTZ NOT NULL DEFAULT NOW();