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

backend/migrations/172_composite_model_routes.sql

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+CREATE TABLE IF NOT EXISTS composite_model_routes (
+    id BIGSERIAL PRIMARY KEY,
+    group_id BIGINT NOT NULL REFERENCES groups(id) ON DELETE CASCADE,
+    public_model VARCHAR(200) NOT NULL,
+    match_type VARCHAR(20) NOT NULL DEFAULT 'exact',
+    target_platform VARCHAR(50) NOT NULL,
+    upstream_model VARCHAR(200) NOT NULL DEFAULT '',
+    endpoint VARCHAR(50) NOT NULL DEFAULT 'any',
+    priority INTEGER NOT NULL DEFAULT 100,
+    enabled BOOLEAN NOT NULL DEFAULT TRUE,
+    notes TEXT,
+    created_at TIMESTAMPTZ NOT NULL DEFAULT NOW(),
+    updated_at TIMESTAMPTZ NOT NULL DEFAULT NOW(),
+    deleted_at TIMESTAMPTZ NULL,
+    CONSTRAINT composite_model_routes_match_type_check CHECK (match_type IN ('exact', 'prefix')),
+    CONSTRAINT composite_model_routes_endpoint_check CHECK (endpoint IN ('any', 'messages', 'count_tokens', 'responses', 'chat_completions', 'embeddings', 'images', 'gemini')),
+    CONSTRAINT composite_model_routes_target_platform_check CHECK (target_platform IN ('anthropic', 'openai', 'gemini', 'antigravity', 'grok'))
+);
+
+CREATE UNIQUE INDEX IF NOT EXISTS idx_composite_model_routes_unique_active
+    ON composite_model_routes (group_id, endpoint, match_type, public_model)
+    WHERE deleted_at IS NULL;
+
+CREATE INDEX IF NOT EXISTS idx_composite_model_routes_group_enabled
+    ON composite_model_routes (group_id, enabled)
+    WHERE deleted_at IS NULL;
+
+CREATE INDEX IF NOT EXISTS idx_composite_model_routes_group_priority
+    ON composite_model_routes (group_id, priority, id)
+    WHERE deleted_at IS NULL;