fix(provider): remove V4 Pro retirement notices

[Vizards]

Related issues

N/A

Problem

DeepSeek has cancelled the planned retirement of V4 Pro and will continue providing API services with the billing method unchanged (official notice). The extension still warns that Pro will retire on September 14, 2026 at 12:00 Beijing time, then marks it retired and hides its pricing.

Changes and scope

• Remove Pro retirement notices and the date-based transition so Pro continues to display its existing prices. Keep retirement notices for the two legacy Flash model names.
• Preserve API-key warnings and suppress official pricing for custom endpoints or mapped model IDs. Model IDs, request handling, reasoning, and Vision Proxy behavior remain unchanged.
• Update English and Chinese documentation, place Pro second in the README model tables, and simplify the model walkthrough.
• Use a fix(provider): Conventional Commit for a patch release, expected to be 0.9.1 from the current 0.9.0. Version files and CHANGELOG remain managed by release-please.

Validation

• Lint, formatting, TypeScript compilation, and VSIX packaging passed.
• 27 local synthetic regression tests passed, covering pricing before/at/after the cancelled retirement date, refresh behavior, custom providers, missing API keys, legacy Flash notices, requests, and vision handling. The existing regression harness is local under .dev/ and is not included in this PR.
• Reviewed both language versions, verified model-table order and walkthrough removals, and regenerated the Marketplace README.
• git diff --check passed.

Final checks

• I reviewed and can explain every change
• I reviewed any user-facing text changes in both English and Chinese
• This pull request contains no API keys, authorization headers, private prompts, private code, or unreviewed sensitive logs

[chatgpt-codex-connector]

Codex Review Summary

This comment shows the latest Codex review activity on this pull request.

Review	Status	Commit	Review trigger
📝 Code Review	✅ Completed 2026-09-11T12:58:59.301530Z	7bfcfd3	PR opened

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[Copilot]

🟢 Approval recommended

The changes consistently remove only Pro retirement behavior while preserving legacy Flash notices and pricing safeguards.

Pull request overview

Removes the cancelled V4 Pro retirement behavior while retaining legacy Flash retirement handling.

Changes:

• Removes Pro retirement notices and date-based transitions.
• Preserves custom-provider pricing suppression and legacy Flash warnings.
• Updates English and Chinese documentation.

File summaries

File	Description
src/provider/retirement.ts	Limits retirement notices to legacy Flash IDs.
src/provider/models.ts	Uses the simplified retirement API.
src/i18n.ts	Removes Pro retirement translations.
resources/walkthrough/show-models.nls.zh-cn.md	Simplifies Chinese model guidance.
resources/walkthrough/show-models.md	Simplifies English model guidance.
README.zh-cn.md	Updates Chinese Pro availability documentation.
README.md	Updates English Pro availability documentation.
package.nls.zh-cn.json	Corrects Chinese Vision Proxy wording.
package.nls.json	Corrects English Vision Proxy wording.

Review details

• Files reviewed: 9/9 changed files
• Comments generated: 0
• Review effort level: Balanced

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