(improvement) Move out the datasource and merge the datasource with the model, and adapt the chat module (#423)

Co-authored-by: jolunoluo <jolunoluo@tencent.com>

launchers/standalone/src/main/resources/db/schema-mysql.sql

@@ -453,4 +453,14 @@ CREATE TABLE s2_sys_parameter
     id  int primary key AUTO_INCREMENT COMMENT '主键id',
     admin varchar(500) COMMENT '系统管理员',
     parameters text null COMMENT '配置项'
+);
+
+CREATE TABLE s2_model_rela
+(
+    id             bigint primary key AUTO_INCREMENT,
+    domain_id       bigint,
+    from_model_id    bigint,
+    to_model_id      bigint,
+    join_type       VARCHAR(255),
+    join_condition  VARCHAR(255)
 );