Sub2API v1.0 - AI API 网关（二开初始版本，基于上游 Wei-Shaw/sub2api）

backend/migrations/032_add_api_key_ip_restriction.sql

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+-- Add IP restriction fields to api_keys table
+-- ip_whitelist: JSON array of allowed IPs/CIDRs (if set, only these IPs can use the key)
+-- ip_blacklist: JSON array of blocked IPs/CIDRs (these IPs are always blocked)
+
+ALTER TABLE api_keys ADD COLUMN IF NOT EXISTS ip_whitelist JSONB DEFAULT NULL;
+ALTER TABLE api_keys ADD COLUMN IF NOT EXISTS ip_blacklist JSONB DEFAULT NULL;
+
+COMMENT ON COLUMN api_keys.ip_whitelist IS 'JSON array of allowed IPs/CIDRs, e.g. ["192.168.1.100", "10.0.0.0/8"]';
+COMMENT ON COLUMN api_keys.ip_blacklist IS 'JSON array of blocked IPs/CIDRs, e.g. ["1.2.3.4", "5.6.0.0/16"]';