feat(ECR-020): QualityFeedback 问答质量反馈并 Closed

新增 ask_quality_feedback、运营/C端评分 API 与 admin-h5 问答反馈区；禁改消息/UGC/真支付。

Co-authored-by: Cursor <cursoragent@cursor.com>

apps/api/migrations/000021_ask_quality_feedback.down.sql

@@ -0,0 +1,4 @@
+-- ECR-020 down
+
+DELETE FROM admin_role_permissions WHERE code = 'admin.ask.feedback.write';
+DROP TABLE IF EXISTS ask_quality_feedback;

apps/api/migrations/000021_ask_quality_feedback.up.sql

@@ -0,0 +1,23 @@
+-- ECR-020 QualityFeedback
+
+CREATE TABLE IF NOT EXISTS ask_quality_feedback (
+  id uuid PRIMARY KEY DEFAULT gen_random_uuid(),
+  thread_id uuid NOT NULL REFERENCES ask_threads(id),
+  message_id uuid NULL REFERENCES ask_messages(id),
+  source varchar(16) NOT NULL CHECK (source IN ('admin','user')),
+  rating smallint NOT NULL CHECK (rating >= 1 AND rating <= 5),
+  tag varchar(32) NULL CHECK (tag IS NULL OR tag IN ('helpful','off_topic','unsafe','other')),
+  note text NULL,
+  created_by_admin uuid NULL REFERENCES admin_accounts(id),
+  created_by_user uuid NULL REFERENCES users(id),
+  created_at timestamptz NOT NULL DEFAULT now()
+);
+
+CREATE INDEX IF NOT EXISTS idx_ask_qf_thread ON ask_quality_feedback(thread_id);
+CREATE INDEX IF NOT EXISTS idx_ask_qf_created ON ask_quality_feedback(created_at DESC);
+
+INSERT INTO admin_role_permissions(role_id, code)
+SELECT r.id, 'admin.ask.feedback.write'
+FROM admin_roles r
+WHERE r.name = 'super_admin'
+ON CONFLICT DO NOTHING;