docs: fix Quick Start examples in Chat & Message API docs to match MemOSClient signatures

[hiasky]

Description

#1742 (review)
Fix the Chat and Message API reference docs where Quick Start code examples used parameters not present in the actual MemOSClient (see src/memos/api/client.py):

• chat/chat.md: replaced readable_cube_ids/writable_cube_ids/mode with conversation_id/knowledgebase_ids to match client.chat() signature
• feedback.md: replaced history/writable_cube_ids/retrieved_memory_ids/corrected_answer with conversation_id to match client.add_feedback()
• get_suggestion_queries.md: replaced MemOSClient.get_suggestions() (method does not exist) with raw requests.post() call; removed duplicate H1 heading
• feedback.md: fixed comment mismatch (said "occupation" but example was about diet)

Chinese source (docs/cn/) and English translation (docs/en/) aligned to stay in sync.

Also added English translations for Chat & Message API reference (inherited from previous PR, now synced with the corrected examples).

Related Issue (Required): Fixes #

Type of change

• Bug fix (non-breaking change which fixes an issue)
• New feature (non-breaking change which adds functionality)
• Breaking change (fix or feature that would cause existing functionality to not work as expected)
• Refactor (does not change functionality, e.g. code style improvements, linting)
• Documentation update

How Has This Been Tested?

• Unit Test
• Test Script Or Test Steps (please provide)
• Pipeline Automated API Test (please provide)

Verified that:

1. All examples use parameters matching src/memos/api/client.py method signatures
2. Chinese and English files share identical API paths, parameter tables, and code blocks
3. Markdown renders correctly

Checklist

• I have performed a self-review of my own code | 我已自行检查了自己的代码
• I have commented my code in hard-to-understand areas | 我已在难以理解的地方对代码进行了注释
• I have added tests that prove my fix is effective or that my feature works | 我已添加测试以证明我的修复有效或功能正常
• I have created related documentation issue/PR in MemOS-Docs (if applicable) | 我已在 MemOS-Docs 中创建了相关的文档 issue/PR（如果适用）
• I have linked the issue to this PR (if applicable) | 我已将 issue 链接到此 PR（如果适用）
• I have mentioned the person who will review this PR | 我已提及将审查此 PR 的人

Reviewer Checklist

• closes #xxxx (Replace xxxx with the GitHub issue number)
• Made sure Checks passed
• Tests have been provided