feat: add alibaba bailian coding plan provider

[zdianjiang]

Summary

Add Alibaba Bailian (百炼) Coding Plan as a new LLM provider with both OpenAI-compatible and Anthropic-compatible endpoints.
Bailian Coding Plan is Alibaba's coding-optimized API service that provides access to multiple models (Kimi K2.5, Qwen3.5, GLM-5, MiniMax, etc.) through a unified endpoint with special DashScope headers.

Changes

• Add bailian_coding_openai provider — OpenAI-compatible endpoint via OpenAIDriver
• Add bailian_coding_anthropic provider — Anthropic-compatible endpoint via AnthropicDriver
• Add extra_headers support to AnthropicDriver for DashScope-specific headers
• Add 4 new URL constants: BAILIAN_CODING_OPENAI_BASE_URL, BAILIAN_CODING_OPENAI_INTL_BASE_URL, BAILIAN_CODING_ANTHROPIC_BASE_URL, BAILIAN_CODING_ANTHROPIC_INTL_BASE_URL
• Add 16 model entries (8 models × 2 protocols): kimi-k2.5, qwen3.5-plus, qwen3-max, qwen3-coder-next, qwen3-coder-plus, MiniMax-M2.5, glm-5, glm-4.7
• Update provider count: 36 in drivers, 40 in catalog

Testing

• cargo clippy --workspace --all-targets -- -D warnings passes
• cargo test --workspace passes
• Live integration tested (if applicable)

Security

• No new unsafe code
• No secrets or API keys in diff
• User input validated at boundaries

API Key

Environment variable: BAILIAN_API_KEY

Providers

Provider	Protocol	Base URL
bailian_coding_openai	OpenAI-compatible	https://coding.dashscope.aliyuncs.com/v1
bailian_coding_anthropic	Anthropic-compatible	https://coding.dashscope.aliyuncs.com/apps/anthropic

Usage

OpenAI Protocol:

[default_model]
provider = "bailian_coding_openai"
model = "qwen3.5-plus"

Anthropic Protocol:

[default_model]
provider = "bailian_coding_anthropic"
model = "qwen3.5-plus"

Note

Bailian Coding Plan uses a subscription-based pricing model (not per-token pricing) and is only available for authorized coding agents. API keys start with sk-sp-.

For international users, use the -intl endpoints by setting base_url explicitly:

[default_model]
provider = "bailian_coding_openai"
model = "qwen3.5-plus"
base_url = "https://coding-intl.dashscope.aliyuncs.com/v1"

[zxl-coder-ai]

直接改配置文件也能用：

[default_model]
provider = "codex"
model = "qwen3.5-plus"
base_url = "https://coding-intl.dashscope.aliyuncs.com/v1"

[zxl-coder-ai]

apikeyenv的名字不要用openai 的标准名；自己随便定一个，如： ALI_CODE_PLAN_KEY ，然后写到 .env 文件内就可以了

[zdianjiang]

apikeyenv的名字不要用openai 的标准名；自己随便定一个，如： ALI_CODE_PLAN_KEY ，然后写到 .env 文件内就可以了

apikeyenv的名字不要用openai 的标准名；自己随便定一个，如： ALI_CODE_PLAN_KEY ，然后写到 .env 文件内就可以了

这个怕是好多人不会