feat: wire up loyalty + chat — register routes, API types, connect LoyaltyPage, add ChatWidget to layout

backend/migrations/039_chat.sql

@@ -0,0 +1,30 @@
+CREATE TABLE IF NOT EXISTS chat_rooms (
+  id         UUID        PRIMARY KEY DEFAULT gen_random_uuid(),
+  hotel_id   UUID        NOT NULL REFERENCES hotels(id) ON DELETE CASCADE,
+  type       VARCHAR(10) NOT NULL DEFAULT 'general' CHECK (type IN ('general', 'direct')),
+  name       VARCHAR(100),
+  created_at TIMESTAMPTZ NOT NULL DEFAULT NOW()
+);
+
+CREATE TABLE IF NOT EXISTS chat_room_members (
+  room_id UUID NOT NULL REFERENCES chat_rooms(id) ON DELETE CASCADE,
+  user_id UUID NOT NULL REFERENCES users(id) ON DELETE CASCADE,
+  PRIMARY KEY (room_id, user_id)
+);
+
+CREATE TABLE IF NOT EXISTS chat_messages (
+  id         UUID        PRIMARY KEY DEFAULT gen_random_uuid(),
+  room_id    UUID        NOT NULL REFERENCES chat_rooms(id) ON DELETE CASCADE,
+  hotel_id   UUID        NOT NULL REFERENCES hotels(id) ON DELETE CASCADE,
+  sender_id  UUID        NOT NULL REFERENCES users(id) ON DELETE CASCADE,
+  text       TEXT        NOT NULL,
+  created_at TIMESTAMPTZ NOT NULL DEFAULT NOW()
+);
+CREATE INDEX IF NOT EXISTS idx_chat_messages_room ON chat_messages(room_id, created_at DESC);
+
+CREATE TABLE IF NOT EXISTS chat_read_status (
+  room_id    UUID        NOT NULL REFERENCES chat_rooms(id) ON DELETE CASCADE,
+  user_id    UUID        NOT NULL REFERENCES users(id) ON DELETE CASCADE,
+  last_read  TIMESTAMPTZ NOT NULL DEFAULT NOW(),
+  PRIMARY KEY (room_id, user_id)
+);