Add MiniMax provider configuration

[octo-patch]

Reason: Add a configurable MiniMax provider with the current text models and regional endpoints.

• Added a shared MiniMax chat helper with the current text model metadata and global/CN OpenAI-compatible endpoints.
• Switched the three Xiaoyue server entry points to the MiniMax chat helper and health reporting.
• Updated the main browser status text and the sample environment file for MiniMax configuration.

Checks:

• node --check projects/xiaoyue-web/lib/minimax-chat.js
• node --check projects/xiaoyue-web/server.js
• node --check projects/xiaoyue-web/server-with-openclaw.js
• node --check projects/xiaoyue-web/server-openclaw.js
• npm ci --ignore-scripts
• MINIMAX_REGION=cn_zh MINIMAX_MODEL=MiniMax-M2.7 MINIMAX_API_KEY=test-key node - <<'NODE'
  const { resolveMiniMaxConfig } = require('./lib/minimax-chat');
  const config = resolveMiniMaxConfig();
  console.log(JSON.stringify({
  provider: config.providerName,
  region: config.region,
  base: config.apiBaseUrl,
  model: config.modelId,
  models: config.modelIds,
  }, null, 2));
  NODE

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