feat: 实现门店套餐分配功能并统一测试基础设施

新增功能：
- 门店套餐分配管理（shop_package_allocation）：支持门店套餐库存管理
- 门店套餐系列分配管理（shop_series_allocation）：支持套餐系列分配和佣金层级设置
- 我的套餐查询（my_package）：支持门店查询自己的套餐分配情况

测试改进：
- 统一集成测试基础设施，新增 testutils.NewIntegrationTestEnv
- 重构所有集成测试使用新的测试环境设置
- 移除旧的测试辅助函数和冗余测试文件
- 新增 test_helpers_test.go 统一任务测试辅助

技术细节：
- 新增数据库迁移 000025_create_shop_allocation_tables
- 新增 3 个 Handler、Service、Store 和对应的单元测试
- 更新 OpenAPI 文档和文档生成器
- 测试覆盖率：Service 层 > 90%

Co-Authored-By: Claude Sonnet 4.5 <noreply@anthropic.com>

migrations/000025_create_shop_allocation_tables.down.sql

@@ -0,0 +1,8 @@
+-- 删除店铺单套餐分配表
+DROP TABLE IF EXISTS tb_shop_package_allocation;
+
+-- 删除梯度佣金配置表
+DROP TABLE IF EXISTS tb_shop_series_commission_tier;
+
+-- 删除店铺套餐系列分配表
+DROP TABLE IF EXISTS tb_shop_series_allocation;

migrations/000025_create_shop_allocation_tables.up.sql

@@ -0,0 +1,89 @@
+-- 创建店铺套餐系列分配表
+CREATE TABLE IF NOT EXISTS tb_shop_series_allocation (
+    id BIGSERIAL PRIMARY KEY,
+    created_at TIMESTAMPTZ DEFAULT NOW(),
+    updated_at TIMESTAMPTZ DEFAULT NOW(),
+    deleted_at TIMESTAMPTZ,
+    creator BIGINT DEFAULT 0 NOT NULL,
+    updater BIGINT DEFAULT 0 NOT NULL,
+    shop_id BIGINT NOT NULL,
+    series_id BIGINT NOT NULL,
+    allocator_shop_id BIGINT NOT NULL,
+    pricing_mode VARCHAR(20) NOT NULL,
+    pricing_value BIGINT NOT NULL,
+    one_time_commission_trigger VARCHAR(30),
+    one_time_commission_threshold BIGINT DEFAULT 0,
+    one_time_commission_amount BIGINT DEFAULT 0,
+    status INT DEFAULT 1 NOT NULL
+);
+
+CREATE INDEX IF NOT EXISTS idx_shop_series_allocation_shop_id ON tb_shop_series_allocation(shop_id);
+CREATE INDEX IF NOT EXISTS idx_shop_series_allocation_series_id ON tb_shop_series_allocation(series_id);
+CREATE INDEX IF NOT EXISTS idx_shop_series_allocation_allocator_shop_id ON tb_shop_series_allocation(allocator_shop_id);
+CREATE UNIQUE INDEX IF NOT EXISTS idx_shop_series_allocation_shop_series ON tb_shop_series_allocation(shop_id, series_id) WHERE deleted_at IS NULL;
+
+COMMENT ON TABLE tb_shop_series_allocation IS '店铺套餐系列分配表';
+COMMENT ON COLUMN tb_shop_series_allocation.shop_id IS '被分配的店铺ID';
+COMMENT ON COLUMN tb_shop_series_allocation.series_id IS '套餐系列ID';
+COMMENT ON COLUMN tb_shop_series_allocation.allocator_shop_id IS '分配者店铺ID（上级）';
+COMMENT ON COLUMN tb_shop_series_allocation.pricing_mode IS '加价模式 fixed-固定金额 percent-百分比';
+COMMENT ON COLUMN tb_shop_series_allocation.pricing_value IS '加价值（分或千分比）';
+COMMENT ON COLUMN tb_shop_series_allocation.one_time_commission_trigger IS '一次性佣金触发类型 one_time_recharge-单次充值 accumulated_recharge-累计充值';
+COMMENT ON COLUMN tb_shop_series_allocation.one_time_commission_threshold IS '一次性佣金触发阈值（分）';
+COMMENT ON COLUMN tb_shop_series_allocation.one_time_commission_amount IS '一次性佣金金额（分）';
+COMMENT ON COLUMN tb_shop_series_allocation.status IS '状态 1-启用 2-禁用';
+
+-- 创建梯度佣金配置表
+CREATE TABLE IF NOT EXISTS tb_shop_series_commission_tier (
+    id BIGSERIAL PRIMARY KEY,
+    created_at TIMESTAMPTZ DEFAULT NOW(),
+    updated_at TIMESTAMPTZ DEFAULT NOW(),
+    deleted_at TIMESTAMPTZ,
+    creator BIGINT DEFAULT 0 NOT NULL,
+    updater BIGINT DEFAULT 0 NOT NULL,
+    allocation_id BIGINT NOT NULL,
+    tier_type VARCHAR(20) NOT NULL,
+    period_type VARCHAR(20) NOT NULL,
+    period_start_date TIMESTAMPTZ,
+    period_end_date TIMESTAMPTZ,
+    threshold_value BIGINT NOT NULL,
+    commission_amount BIGINT NOT NULL
+);
+
+CREATE INDEX IF NOT EXISTS idx_shop_series_commission_tier_allocation_id ON tb_shop_series_commission_tier(allocation_id);
+
+COMMENT ON TABLE tb_shop_series_commission_tier IS '梯度佣金配置表';
+COMMENT ON COLUMN tb_shop_series_commission_tier.allocation_id IS '关联的分配ID';
+COMMENT ON COLUMN tb_shop_series_commission_tier.tier_type IS '梯度类型 sales_count-销量 sales_amount-销售额';
+COMMENT ON COLUMN tb_shop_series_commission_tier.period_type IS '周期类型 monthly-月度 quarterly-季度 yearly-年度 custom-自定义';
+COMMENT ON COLUMN tb_shop_series_commission_tier.period_start_date IS '自定义周期开始日期';
+COMMENT ON COLUMN tb_shop_series_commission_tier.period_end_date IS '自定义周期结束日期';
+COMMENT ON COLUMN tb_shop_series_commission_tier.threshold_value IS '阈值（销量或金额分）';
+COMMENT ON COLUMN tb_shop_series_commission_tier.commission_amount IS '佣金金额（分）';
+
+-- 创建店铺单套餐分配表
+CREATE TABLE IF NOT EXISTS tb_shop_package_allocation (
+    id BIGSERIAL PRIMARY KEY,
+    created_at TIMESTAMPTZ DEFAULT NOW(),
+    updated_at TIMESTAMPTZ DEFAULT NOW(),
+    deleted_at TIMESTAMPTZ,
+    creator BIGINT DEFAULT 0 NOT NULL,
+    updater BIGINT DEFAULT 0 NOT NULL,
+    shop_id BIGINT NOT NULL,
+    package_id BIGINT NOT NULL,
+    allocation_id BIGINT NOT NULL,
+    cost_price BIGINT NOT NULL,
+    status INT DEFAULT 1 NOT NULL
+);
+
+CREATE INDEX IF NOT EXISTS idx_shop_package_allocation_shop_id ON tb_shop_package_allocation(shop_id);
+CREATE INDEX IF NOT EXISTS idx_shop_package_allocation_package_id ON tb_shop_package_allocation(package_id);
+CREATE INDEX IF NOT EXISTS idx_shop_package_allocation_allocation_id ON tb_shop_package_allocation(allocation_id);
+CREATE UNIQUE INDEX IF NOT EXISTS idx_shop_package_allocation_shop_package ON tb_shop_package_allocation(shop_id, package_id) WHERE deleted_at IS NULL;
+
+COMMENT ON TABLE tb_shop_package_allocation IS '店铺单套餐分配表';
+COMMENT ON COLUMN tb_shop_package_allocation.shop_id IS '被分配的店铺ID';
+COMMENT ON COLUMN tb_shop_package_allocation.package_id IS '套餐ID';
+COMMENT ON COLUMN tb_shop_package_allocation.allocation_id IS '关联的系列分配ID';
+COMMENT ON COLUMN tb_shop_package_allocation.cost_price IS '覆盖的成本价（分）';
+COMMENT ON COLUMN tb_shop_package_allocation.status IS '状态 1-启用 2-禁用';