feat(feedback): implement user feedback collection system with email reporting

Backend:
- Add user_feedback table with RLS policy
- Create feedback submission API (multipart/form-data)
- Implement xlsx report generation with embedded images
- Add scheduled email delivery via Feishu SMTP
- Create HTML email templates (daily_report, no_feedback)

Frontend:
- Add feedback screen with type selection and image picker
- Support anonymous submission via skipAuth flag
- Collect device info and app version

Protocol:
- Document feedback API contract and error codes
- Update http-error-codes.md with FEEDBACK_* codes

backend/scripts/trigger_feedback_report.py

@@ -0,0 +1,26 @@
+"""手动触发 worker-general 定时任务：生成反馈报告
+
+用法:
+    cd /home/qzl/Code/eryao/.worktrees/feat-user-feedback
+    PYTHONPATH=backend/src uv run python backend/scripts/trigger_feedback_report.py
+"""
+
+from __future__ import annotations
+
+import sys
+from pathlib import Path
+
+sys.path.insert(0, str(Path(__file__).resolve().parent.parent / "src"))
+
+from core.taskiq.app import worker_general_broker
+from v1.feedback.tasks import generate_daily_feedback_report
+
+
+def main():
+    task = generate_daily_feedback_report.kiq()
+    result = worker_general_broker.wait_result(task, timeout=120)
+    print(f"Task result: {result.return_value}")
+
+
+if __name__ == "__main__":
+    main()