fix: 复合主键表改为单字段 id 以支持 ent 完整生成

desc/sql/shop/shop_players.sql

@@ -1,5 +1,6 @@
 CREATE TABLE shop_players
 (
+    id         BIGINT PRIMARY KEY,
     shop_id    BIGINT      NOT NULL REFERENCES shops (id),
     player_id  BIGINT      NOT NULL,
 
@@ -8,7 +9,7 @@ CREATE TABLE shop_players
     joined_at  TIMESTAMPTZ NOT NULL DEFAULT NOW(),
     left_at    TIMESTAMPTZ, -- 软删除，表示已离职
 
-    PRIMARY KEY (shop_id, player_id)
+    UNIQUE (shop_id, player_id)
 );
 
 -- 索引