chore(provider): limit forced none thinking to official api

[Vizards]

Summary

• centralize official DeepSeek endpoint helpers in src/endpoint.ts
• keep fix(provider): disable thinking for internal helper requests #137 forced none thinking behavior only on the official DeepSeek API
• preserve configured thinking effort for custom/third-party endpoints

Verification

• npm run format:check
• npm run lint
• npm run compile

[Copilot]

Pull request overview

This PR centralizes DeepSeek “official endpoint” helpers into src/endpoint.ts and scopes the “force thinking=none for helper/internal requests” behavior so it only applies when using the official DeepSeek API, preserving user-configured thinking effort for custom/third-party endpoints.

Changes:

• Added src/endpoint.ts to host isOfficialDeepSeekBaseUrl/normalizeBaseUrl and the official host constant.
• Updated provider request preparation to only force thinking=none for helper requests when targeting the official DeepSeek base URL.
• Rewired pricing and error-handling code to use the centralized endpoint helpers and removed the duplicated official-host constant.

Reviewed changes

Copilot reviewed 5 out of 5 changed files in this pull request and generated 1 comment.

Show a summary per file

File	Description
src/provider/request.ts	Restricts forced none-thinking behavior to the official API (and refactors baseUrl handling).
src/provider/pricing/currency.ts	Switches to centralized endpoint helpers and removes local duplicates.
src/endpoint.ts	New shared utilities/constants for normalizing and recognizing official endpoints.
src/client/error/index.ts	Uses the centralized official-endpoint detection for provider identification.
src/client/consts.ts	Removes the official host constant now owned by src/endpoint.ts.

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[Copilot]

Pull request overview

Copilot reviewed 5 out of 5 changed files in this pull request and generated no new comments.