docs: update authentication methods to reflect OAuth discontinuation (#3325)

* docs: update authentication methods to reflect OAuth discontinuation

Remove deprecated Qwen OAuth references and update documentation to
direct users to valid authentication methods (API Key, Coding Plan,
or Local Inference) following the OAuth free tier discontinuation on
2026-04-15.

Closes #3316

* docs: fix quickstart auth description to match actual /auth UI

The /auth command shows three options: Alibaba Cloud Coding Plan,
API Key, and Qwen OAuth (discontinued). Updated quickstart.md to
accurately reflect this UI instead of splitting into Option A/B/C.

Also updated settings.md, commands.md, and troubleshooting.md with
minor OAuth-related cleanups.

* docs: update .qwen workspace description in quickstart

Remove reference to 'Qwen account' since OAuth is discontinued.
The .qwen directory is created by Qwen Code itself for storing
credentials, configuration, and session data.

* docs: fix warning block formatting in quickstart

- Add missing '>' continuation for the OAuth discontinuation warning block

Co-authored-by: Qwen-Coder <qwen-coder@alibabacloud.com>

* docs: update README Qwen3.6-Plus description

- Remove mention of running Qwen3.6-Plus locally via Ollama/vLLM
- Keep only the Alibaba Cloud ModelStudio API key option

Co-authored-by: Qwen-Coder <qwen-coder@alibabacloud.com>

* docs: address review feedback - remove Local Inference from auth, add dual-region links

- Local Inference removed from auth method lists, kept as separate
  'Local Model Setup' section with detailed Ollama/vLLM config examples
- All links now provide dual-region URLs (Beijing + intl)
- .qwen workspace note restored to original meaning (cost tracking)
- Device auth flow error kept scoped to legacy OAuth
- API setup guide links updated with confirmed intl URL

---------

Co-authored-by: Qwen-Coder <qwen-coder@alibabacloud.com>
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@ -32,7 +32,7 @@ cd your-project
qwen
```
Select **Qwen OAuth (Free)** authentication and follow the prompts to log in. Then let's start with understanding your codebase. Try one of these commands:
Choose your authentication method — **API Key** or **[Alibaba Cloud Coding Plan](https://bailian.console.aliyun.com/cn-beijing/?tab=coding-plan#/efm/coding-plan-index)** ([intl](https://modelstudio.console.alibabacloud.com/?tab=coding-plan#/efm/coding-plan-index)) — and follow the prompts to configure. See the API setup guide ([Beijing](https://bailian.console.aliyun.com/cn-beijing/?tab=doc#/doc/?type=model&url=3023091) / [intl](https://modelstudio.console.alibabacloud.com/ap-southeast-1?tab=doc#/doc/?type=model&url=2974721)) for step-by-step instructions. Then let's start with understanding your codebase. Try one of these commands:
```
what does this project do?