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

backend/migrations/221_group_model_pricing.sql

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+ALTER TABLE groups
+    ADD COLUMN IF NOT EXISTS long_context_pricing_enabled BOOLEAN NOT NULL DEFAULT TRUE,
+    ADD COLUMN IF NOT EXISTS model_pricing JSONB;
+
+UPDATE groups
+SET long_context_pricing_enabled = TRUE
+WHERE long_context_pricing_enabled IS DISTINCT FROM TRUE;
+
+COMMENT ON COLUMN groups.long_context_pricing_enabled IS
+    'Whether token pricing selects official/preset long-context tiers; default true preserves existing long-context billing';
+COMMENT ON COLUMN groups.model_pricing IS
+    'Per-model group pricing overrides channel and built-in model pricing';