feat: complete Phase 0 Enterprise IAM

src/db/migrations/0003_create_user_profiles.sql

@@ -1,7 +0,0 @@
-CREATE TABLE IF NOT EXISTS user_profiles (
-    user_id       TEXT PRIMARY KEY NOT NULL REFERENCES users(id) ON DELETE CASCADE,
-    email         TEXT,
-    full_name     TEXT,
-    avatar_url    TEXT,
-    metadata_json TEXT
-);