feat(ECR-039): GrowthInsights FunnelDefinition 只读并 Closed

FunnelDefinition catalog (000040) · Loop continuous.

apps/api/migrations/000040_funnel_definitions.down.sql

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+DROP TABLE IF EXISTS funnel_definitions;

apps/api/migrations/000040_funnel_definitions.up.sql

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+-- ECR-039 FunnelDefinition (read catalog)
+
+CREATE TABLE IF NOT EXISTS funnel_definitions (
+  id uuid PRIMARY KEY DEFAULT gen_random_uuid(),
+  code varchar(64) NOT NULL UNIQUE,
+  title varchar(128) NOT NULL,
+  active boolean NOT NULL DEFAULT true,
+  system boolean NOT NULL DEFAULT false,
+  created_at timestamptz NOT NULL DEFAULT now(),
+  updated_at timestamptz NOT NULL DEFAULT now()
+);
+
+CREATE INDEX IF NOT EXISTS idx_funnel_definitions_active ON funnel_definitions(active);
+
+INSERT INTO funnel_definitions(code, title, active, system)
+VALUES ('signup_to_ask', '注册到问答漏斗占位', true, true)
+ON CONFLICT (code) DO NOTHING;