fix: disambiguate VS Code vision models

[Vizards]

Summary

• store VS Code vision model selections as provider-qualified vendor/id keys
• filter unsupported Claude Code/Copilot CLI vision candidates from the proxy picker
• keep legacy bare model IDs readable, including IDs that contain /

Fixes #149

Validation

• npm run format:check
• npm run compile
• node .vscode-test/vision-provider-collision.test.js
• git diff --check

[Copilot]

Pull request overview

This PR resolves VS Code “vision model” selection collisions by storing the selected vision model as a provider-qualified vendor/id key (while still accepting legacy bare IDs), and by filtering out known unsupported Claude Code / Copilot CLI vision candidates so the proxy picker doesn’t offer unusable choices.

Changes:

• Store and propagate the selected VS Code vision model as lmModelKey (vendor/id) end-to-end (UI state, webview payload, config save/load).
• Add VS Code model key parsing/normalization to keep legacy bare IDs (including IDs containing /) readable and migratable.
• Centralize vision-related logging and extend model filtering using vendor + best-effort targetChatSessionType metadata.

Reviewed changes

Copilot reviewed 14 out of 14 changed files in this pull request and generated no comments.

Show a summary per file

File	Description
src/provider/vision/ui/script.ts	Switches webview script from lmModelId to provider-qualified lmModelKey handling.
src/provider/vision/ui/panel.ts	Updates panel state/payload plumbing and config save path to use lmModelKey, and routes logging through new vision logger helpers.
src/provider/vision/ui/html.ts	Renames the LM select element/id to lmModelKey to match the new payload shape.
src/provider/vision/types.ts	Adds key to VisionLanguageModelOption so UI/options can carry provider-qualified identifiers.
src/provider/vision/sources/vscode/model.ts	Adds best-effort accessor for proposed targetChatSessionType metadata.
src/provider/vision/sources/vscode/index.ts	Implements vendor/id key generation, legacy-compatible parsing, model filtering, and key-based selection/save logic.
src/provider/vision/sources/endpoint/test.ts	Moves test logging into centralized vision log helpers.
src/provider/vision/service.ts	Routes vision proxy selection/config error logging through the new vision log module.
src/provider/vision/resolve.ts	Uses centralized logging for “unavailable” and “describe failed” paths.
src/provider/vision/log.ts	New central logging helpers for vision proxy selection, failures, and test diagnostics.
README.md	Documents deepseek-copilot.visionModel now saving vendor/id while still reading legacy bare IDs.
README.zh-cn.md	Same documentation update (Chinese).
package.nls.json	Updates setting description to reflect vendor/id storage + legacy compatibility.
package.nls.zh-cn.json	Same setting description update (Chinese).

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