feat(feedback): 新增用户反馈提交、分页列表与语音描述

支持 Bug/需求提交、截图与聊天同款语音输入，全站反馈分页浏览与详情页，并从聊天与空间页提供入口。

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

db.mjs

@@ -645,6 +645,25 @@ export async function migrateSchema(pool) {
       WHERE s.user_id = u.id AND s.status = 'active'
     )
   `);
+
+  await pool.query(`
+    CREATE TABLE IF NOT EXISTS h5_user_feedback (
+      id CHAR(36) PRIMARY KEY,
+      user_id CHAR(36) NOT NULL,
+      type ENUM('bug', 'feature', 'other') NOT NULL,
+      title VARCHAR(120) NOT NULL,
+      description TEXT NOT NULL,
+      contact VARCHAR(120) NULL,
+      status ENUM('pending', 'reviewing', 'resolved', 'closed') NOT NULL DEFAULT 'pending',
+      images_json JSON NULL,
+      context_json JSON NULL,
+      created_at BIGINT NOT NULL,
+      updated_at BIGINT NOT NULL,
+      KEY idx_h5_user_feedback_user_created (user_id, created_at),
+      KEY idx_h5_user_feedback_status_created (status, created_at),
+      CONSTRAINT fk_h5_user_feedback_user FOREIGN KEY (user_id) REFERENCES h5_users(id) ON DELETE CASCADE
+    ) ENGINE=InnoDB DEFAULT CHARSET=utf8mb4 COLLATE=utf8mb4_unicode_ci
+  `);
 }
 
 export async function initSchema(pool) {