feat(ECR-033): AskOperations HandoffCase 只读并 Closed

HandoffCase catalog (000034) · Loop continuous.

apps/api/migrations/000034_ask_handoff_cases.down.sql

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+DROP TABLE IF EXISTS ask_handoff_cases;

apps/api/migrations/000034_ask_handoff_cases.up.sql

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+-- ECR-033 HandoffCase (read catalog)
+
+CREATE TABLE IF NOT EXISTS ask_handoff_cases (
+  id uuid PRIMARY KEY DEFAULT gen_random_uuid(),
+  code varchar(64) NOT NULL UNIQUE,
+  title varchar(128) NOT NULL,
+  status varchar(32) NOT NULL CHECK (status IN ('open','closed')),
+  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_ask_handoff_cases_active ON ask_handoff_cases(active);
+
+INSERT INTO ask_handoff_cases(code, title, status, active, system)
+VALUES ('demo_handoff', '示例转接案', 'closed', true, true)
+ON CONFLICT (code) DO NOTHING;