优化客服角色管理页面，修复角色数据重启后被覆盖的问题

src/main/java/com/wok/supportbot/config/DatabaseInitConfig.java

@@ -489,12 +489,7 @@ public class DatabaseInitConfig {
             INSERT INTO customer_service_role (role_key, name, description, prompt)
             VALUES (?, ?, ?, ?)
             ON CONFLICT (role_key)
-            DO UPDATE SET name = EXCLUDED.name,
-                          description = EXCLUDED.description,
-                          prompt = EXCLUDED.prompt,
-                          enabled = true,
-                          is_delete = false,
-                          update_time = CURRENT_TIMESTAMP
+            DO NOTHING
             """, roleKey, name, description, prompt);
     }
 

src/main/resources/init-database.sql

@@ -261,6 +261,40 @@ COMMENT ON COLUMN conversation_session.role_id        IS '归属角色ID';
 COMMENT ON COLUMN conversation_session.create_time    IS '创建时间';
 COMMENT ON COLUMN conversation_session.update_time    IS '更新时间';
 
+-- ============================================================
+-- 表 7.5: mcp_server_config — MCP Server 配置表
+-- ============================================================
+CREATE TABLE IF NOT EXISTS mcp_server_config (
+    id              BIGINT          PRIMARY KEY,
+    name            VARCHAR(100)    NOT NULL,
+    transport_type  VARCHAR(20)     NOT NULL DEFAULT 'sse',
+    server_url      VARCHAR(500),
+    command         VARCHAR(500),
+    args            VARCHAR(1000),
+    env_vars        JSONB           DEFAULT '{}' NOT NULL,
+    description     VARCHAR(500),
+    is_active       BOOLEAN         DEFAULT TRUE NOT NULL,
+    create_time     TIMESTAMP       NOT NULL DEFAULT CURRENT_TIMESTAMP,
+    update_time     TIMESTAMP       NOT NULL DEFAULT CURRENT_TIMESTAMP,
+    is_delete       BOOLEAN         NOT NULL DEFAULT FALSE
+);
+
+CREATE INDEX IF NOT EXISTS idx_mcp_server_config_active ON mcp_server_config (is_active) WHERE is_delete = FALSE;
+
+COMMENT ON TABLE  mcp_server_config            IS 'MCP Server 配置表（管理外部 MCP Server 连接配置）';
+COMMENT ON COLUMN mcp_server_config.id         IS '主键（雪花算法生成）';
+COMMENT ON COLUMN mcp_server_config.name       IS '配置名称';
+COMMENT ON COLUMN mcp_server_config.transport_type IS '传输类型: stdio(标准输入输出) / sse(Server-Sent Events)';
+COMMENT ON COLUMN mcp_server_config.server_url IS 'SSE 模式的 MCP Server URL';
+COMMENT ON COLUMN mcp_server_config.command    IS 'stdio 模式的启动命令';
+COMMENT ON COLUMN mcp_server_config.args       IS 'stdio 模式的命令参数（多个用逗号分隔）';
+COMMENT ON COLUMN mcp_server_config.env_vars   IS '环境变量（JSONB 键值对）';
+COMMENT ON COLUMN mcp_server_config.description IS '描述说明';
+COMMENT ON COLUMN mcp_server_config.is_active  IS '是否启用';
+COMMENT ON COLUMN mcp_server_config.create_time IS '创建时间';
+COMMENT ON COLUMN mcp_server_config.update_time IS '更新时间';
+COMMENT ON COLUMN mcp_server_config.is_delete  IS '逻辑删除: FALSE=正常 TRUE=已删除';
+
 -- ============================================================
 -- 表 8: vector_store — 向量存储表
 -- 注意: Spring AI PgVectorStore 配置了 initializeSchema(true)，