docs: 补充 PRD06 和 PRD07 条目至文档列表表格

[StephenQiu30]

PR Summary

修复 docs/prd/README.md 文档列表表格中缺少 PRD06（视频源接入与适配器扩展）和 PRD07（全局响应格式与异常处理）条目的问题，使表格覆盖 PRD01-PRD09 完整列表。

Test-first Evidence

• Red: 修改前确认表格从 PRD05 直接跳到 PRD08，仅包含 7 个条目
• Green: 修改后 grep -c 'PRD0' docs/prd/README.md 输出 9，PRD01-PRD09 连续完整

Tests added

• Unit test
• Integration test
• E2E test
• No new test applicable (docs-only change)

Commands run

# Red: confirm missing entries
grep '| PRD' docs/prd/README.md
# Output showed PRD05 -> PRD08 gap

# Green: verify completeness
grep -c 'PRD0' docs/prd/README.md
# Output: 9

Result

• Before: 表格缺少 PRD06 和 PRD07 条目（7 个条目）
• After: 表格包含 PRD01-PRD09 完整列表（9 个条目）

Agent Usage

• Acceptance criteria: human-authored from ticket description
• Implementation: agent-generated (2-line table row insertion)

Reviewer Checklist

• PRD01-PRD09 条目格式一致
• 表格无多余或缺失条目
• 无无关修改

Summary by CodeRabbit

• Documentation
  • Updated product requirement documentation with two new draft requirement documents.

[coderabbitai]

No actionable comments were generated in the recent review. 🎉

ℹ️ Recent review info

⚙️ Run configuration

Configuration used: defaults

Review profile: CHILL

Plan: Pro Plus

Run ID: 88e7cf22-934c-44ea-ae1c-b0d58313072b

📥 Commits

Reviewing files that changed from the base of the PR and between 942cc8e and d65ec06.

📒 Files selected for processing (1)

• docs/prd/README.md

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📝 Walkthrough

Walkthrough

Two new rows are appended to the document list table in docs/prd/README.md, registering PRD06 (视频源接入与适配器扩展) and PRD07 (全局响应格式与异常处理), both with status draft.

Changes

PRD Index Update

Layer / File(s)	Summary
Add PRD06 and PRD07 rows to index table docs/prd/README.md	Inserts two new draft entries into the "文档列表" table: PRD06 for video source ingestion/adapter extension and PRD07 for global response format and exception handling.

Estimated code review effort

🎯 1 (Trivial) | ⏱️ ~2 minutes

Poem

🐇 Two new drafts hop into the list,
PRD06 and PRD07 join the mix,
Adapters and responses yet to be kissed,
With a draft stamp and a couple of ticks —
The table grows by two little sticks! 📋

🚥 Pre-merge checks | ✅ 5

✅ Passed checks (5 passed)

Check name	Status	Explanation
Title check	✅ Passed	The title clearly and concisely describes the main change: adding PRD06 and PRD07 entries to the documentation list table.
Description check	✅ Passed	The description covers the required template sections with clear test-first evidence, commands run, results, and reviewer checklist for a documentation change.
Docstring Coverage	✅ Passed	No functions found in the changed files to evaluate docstring coverage. Skipping docstring coverage check.
Linked Issues check	✅ Passed	Check skipped because no linked issues were found for this pull request.
Out of Scope Changes check	✅ Passed	Check skipped because no linked issues were found for this pull request.

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✨ Finishing Touches

🧪 Generate unit tests (beta)

• Create PR with unit tests
• Commit unit tests in branch docs/ste-317-prd-readme-missing-entries

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