feat(cloud): add ChatGPT login and D1 sync

drizzle/0000_lifeos_cloud_state.sql

@@ -0,0 +1,12 @@
+CREATE TABLE lifeos_states (
+  user_id TEXT PRIMARY KEY,
+  profile_json TEXT NOT NULL DEFAULT '{}',
+  memories_json TEXT NOT NULL DEFAULT '[]',
+  museum_json TEXT NOT NULL DEFAULT '[]',
+  settings_json TEXT NOT NULL DEFAULT '{}',
+  system_json TEXT NOT NULL DEFAULT '{}',
+  updated_at TEXT NOT NULL
+);
+
+CREATE INDEX idx_lifeos_states_updated_at
+ON lifeos_states(updated_at);