feat: 新增数据库迁移，重命名 device_no 为 virtual_no，新增 iot_card.virtual_no 和 package.virtual_ratio 字段

Ultraworked with [Sisyphus](https://github.com/code-yeongyu/oh-my-opencode)

Co-authored-by: Sisyphus <clio-agent@sisyphuslabs.ai>

migrations/000073_rename_device_no_to_virtual_no.down.sql

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+-- 回滚：将 virtual_no 改回 device_no
+
+ALTER TABLE tb_device RENAME COLUMN virtual_no TO device_no;
+
+ALTER INDEX IF EXISTS idx_device_virtual_no RENAME TO idx_device_no;
+
+ALTER TABLE tb_personal_customer_device RENAME COLUMN virtual_no TO device_no;

migrations/000073_rename_device_no_to_virtual_no.up.sql

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+-- 将 tb_device 和 tb_personal_customer_device 中的 device_no 字段改名为 virtual_no
+-- 原因：统一"虚拟号"的字段命名，与 tb_iot_card.virtual_no 保持一致
+
+-- 重命名 tb_device.device_no → virtual_no
+ALTER TABLE tb_device RENAME COLUMN device_no TO virtual_no;
+
+-- 同步重命名唯一索引（可选，保持命名一致性）
+ALTER INDEX IF EXISTS idx_device_no RENAME TO idx_device_virtual_no;
+
+-- 重命名 tb_personal_customer_device.device_no → virtual_no
+ALTER TABLE tb_personal_customer_device RENAME COLUMN device_no TO virtual_no;

migrations/000074_add_virtual_no_to_iot_card.down.sql

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+DROP INDEX IF EXISTS idx_iot_card_virtual_no;
+ALTER TABLE tb_iot_card DROP COLUMN IF EXISTS virtual_no;

migrations/000074_add_virtual_no_to_iot_card.up.sql

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+ALTER TABLE tb_iot_card ADD COLUMN IF NOT EXISTS virtual_no VARCHAR(50);
+
+CREATE UNIQUE INDEX IF NOT EXISTS idx_iot_card_virtual_no
+    ON tb_iot_card(virtual_no)
+    WHERE deleted_at IS NULL AND virtual_no IS NOT NULL AND virtual_no <> '';
+
+COMMENT ON COLUMN tb_iot_card.virtual_no IS '虚拟号(可空，全局唯一)';

migrations/000075_add_virtual_ratio_to_package.down.sql

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+ALTER TABLE tb_package DROP COLUMN IF EXISTS virtual_ratio;

migrations/000075_add_virtual_ratio_to_package.up.sql

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+ALTER TABLE tb_package ADD COLUMN IF NOT EXISTS virtual_ratio DECIMAL(18,6) NOT NULL DEFAULT 1.0;
+
+COMMENT ON COLUMN tb_package.virtual_ratio IS '虚流量比例(real_data_mb/virtual_data_mb)，创建套餐时计算存储，默认1.0';
+
+UPDATE tb_package
+SET virtual_ratio = CASE
+    WHEN enable_virtual_data = true AND virtual_data_mb > 0
+        THEN (real_data_mb::DECIMAL / virtual_data_mb::DECIMAL)
+    ELSE 1.0
+END
+WHERE deleted_at IS NULL;