Merge branch 'main' of https://github.com/mt21625457/aicodex2api

backend/migrations/047_add_user_group_rate_multipliers.sql

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+-- 用户专属分组倍率表
+-- 允许管理员为特定用户设置分组的专属计费倍率，覆盖分组默认倍率
+CREATE TABLE IF NOT EXISTS user_group_rate_multipliers (
+    user_id         BIGINT NOT NULL REFERENCES users(id) ON DELETE CASCADE,
+    group_id        BIGINT NOT NULL REFERENCES groups(id) ON DELETE CASCADE,
+    rate_multiplier DECIMAL(10,4) NOT NULL,
+    created_at      TIMESTAMPTZ NOT NULL DEFAULT NOW(),
+    updated_at      TIMESTAMPTZ NOT NULL DEFAULT NOW(),
+    PRIMARY KEY (user_id, group_id)
+);
+
+-- 按 group_id 查询索引（删除分组时清理关联记录）
+CREATE INDEX IF NOT EXISTS idx_user_group_rate_multipliers_group_id
+    ON user_group_rate_multipliers(group_id);
+
+COMMENT ON TABLE user_group_rate_multipliers IS '用户专属分组倍率配置';
+COMMENT ON COLUMN user_group_rate_multipliers.user_id IS '用户ID';
+COMMENT ON COLUMN user_group_rate_multipliers.group_id IS '分组ID';
+COMMENT ON COLUMN user_group_rate_multipliers.rate_multiplier IS '专属计费倍率（覆盖分组默认倍率）';

backend/migrations/048_add_error_passthrough_rules.sql

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+-- Error Passthrough Rules table
+-- Allows administrators to configure how upstream errors are passed through to clients
+
+CREATE TABLE IF NOT EXISTS error_passthrough_rules (
+    id BIGSERIAL PRIMARY KEY,
+    name VARCHAR(100) NOT NULL,
+    enabled BOOLEAN NOT NULL DEFAULT true,
+    priority INTEGER NOT NULL DEFAULT 0,
+    error_codes JSONB DEFAULT '[]',
+    keywords JSONB DEFAULT '[]',
+    match_mode VARCHAR(10) NOT NULL DEFAULT 'any',
+    platforms JSONB DEFAULT '[]',
+    passthrough_code BOOLEAN NOT NULL DEFAULT true,
+    response_code INTEGER,
+    passthrough_body BOOLEAN NOT NULL DEFAULT true,
+    custom_message TEXT,
+    description TEXT,
+    created_at TIMESTAMPTZ NOT NULL DEFAULT NOW(),
+    updated_at TIMESTAMPTZ NOT NULL DEFAULT NOW()
+);
+
+-- Indexes for efficient queries
+CREATE INDEX IF NOT EXISTS idx_error_passthrough_rules_enabled ON error_passthrough_rules (enabled);
+CREATE INDEX IF NOT EXISTS idx_error_passthrough_rules_priority ON error_passthrough_rules (priority);