feat(db): add account and role Flyway migrations

backend/mci-server/src/main/java/com/sino/mci/config/FlywayConfig.java

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+package com.sino.mci.config;
+
+import javax.sql.DataSource;
+
+import org.flywaydb.core.Flyway;
+import org.springframework.boot.autoconfigure.condition.ConditionalOnProperty;
+import org.springframework.context.annotation.Bean;
+import org.springframework.context.annotation.Configuration;
+
+@Configuration
+@ConditionalOnProperty(prefix = "spring.flyway", name = "enabled", havingValue = "true", matchIfMissing = true)
+public class FlywayConfig {
+
+    @Bean(initMethod = "migrate")
+    public Flyway flyway(DataSource dataSource) {
+        return Flyway.configure()
+                .dataSource(dataSource)
+                .locations("classpath:db/migration")
+                .baselineOnMigrate(true)
+                .load();
+    }
+}

backend/mci-server/src/main/resources/db/migration/V1__init_account.sql

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+CREATE TABLE IF NOT EXISTS mci_tenant (
+    id BIGINT AUTO_INCREMENT PRIMARY KEY,
+    tenant_code VARCHAR(64) NOT NULL UNIQUE COMMENT '租户编码',
+    tenant_name VARCHAR(128) NOT NULL COMMENT '租户名称',
+    auth_config JSON COMMENT '认证配置',
+    inbound_webhook_url VARCHAR(512) COMMENT '入站消息推送地址',
+    status TINYINT NOT NULL DEFAULT 1 COMMENT '状态：0禁用 1启用',
+    create_time DATETIME NOT NULL DEFAULT CURRENT_TIMESTAMP,
+    update_time DATETIME NOT NULL DEFAULT CURRENT_TIMESTAMP ON UPDATE CURRENT_TIMESTAMP,
+    deleted TINYINT NOT NULL DEFAULT 0
+) ENGINE=InnoDB DEFAULT CHARSET=utf8mb4 COMMENT='租户/业务系统表';
+
+CREATE TABLE IF NOT EXISTS mci_platform_role (
+    id BIGINT AUTO_INCREMENT PRIMARY KEY,
+    role_code VARCHAR(64) NOT NULL UNIQUE COMMENT '角色编码',
+    role_name VARCHAR(128) NOT NULL COMMENT '角色名称',
+    permissions JSON COMMENT '权限列表',
+    status TINYINT NOT NULL DEFAULT 1,
+    create_time DATETIME NOT NULL DEFAULT CURRENT_TIMESTAMP
+) ENGINE=InnoDB DEFAULT CHARSET=utf8mb4 COMMENT='平台角色表';
+
+CREATE TABLE IF NOT EXISTS mci_user (
+    id BIGINT AUTO_INCREMENT PRIMARY KEY,
+    tenant_code VARCHAR(64) NOT NULL COMMENT '所属租户',
+    username VARCHAR(64) NOT NULL COMMENT '用户名',
+    password VARCHAR(256) NOT NULL COMMENT '加密密码',
+    real_name VARCHAR(128) COMMENT '真实姓名',
+    phone VARCHAR(32) COMMENT '手机号',
+    email VARCHAR(128) COMMENT '邮箱',
+    status TINYINT NOT NULL DEFAULT 1 COMMENT '状态：0禁用 1启用',
+    create_time DATETIME NOT NULL DEFAULT CURRENT_TIMESTAMP,
+    update_time DATETIME NOT NULL DEFAULT CURRENT_TIMESTAMP ON UPDATE CURRENT_TIMESTAMP,
+    deleted TINYINT NOT NULL DEFAULT 0,
+    UNIQUE KEY uk_tenant_username (tenant_code, username, deleted)
+) ENGINE=InnoDB DEFAULT CHARSET=utf8mb4 COMMENT='中台用户表';
+
+CREATE TABLE IF NOT EXISTS mci_user_role (
+    id BIGINT AUTO_INCREMENT PRIMARY KEY,
+    user_id BIGINT NOT NULL COMMENT '用户ID',
+    role_id BIGINT NOT NULL COMMENT '角色ID',
+    create_time DATETIME NOT NULL DEFAULT CURRENT_TIMESTAMP,
+    UNIQUE KEY uk_user_role (user_id, role_id)
+) ENGINE=InnoDB DEFAULT CHARSET=utf8mb4 COMMENT='用户角色关系表';

backend/mci-server/src/main/resources/db/migration/V2__seed_roles.sql

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+INSERT INTO mci_platform_role (role_code, role_name, permissions) VALUES
+('admin', '租户管理员', '["*"]'),
+('operator', '运营操作员', '["send:write", "channel:read", "channel:write", "record:read"]'),
+('viewer', '只读用户', '["record:read", "channel:read"]');