Add ToCodex to VS Code Extensions

[simen189]

This PR adds ToCodex to the VS Code Extensions section.

ToCodex is an open-source enterprise-grade general-purpose AI coding agent that supports both official and third-party models with flexible integration. DeepSeek is integrated as a top-listed built-in model provider in ToCodex, visible in the onboarding provider selector, the settings provider list, and the official website model showcase.

Evidence:

• Official website: DeepSeek V4 Pro is displayed as the first model card in the ToCodex model showcase.
• Onboarding UI: DeepSeek is available as a built-in API provider during initial provider selection.
• Settings UI: DeepSeek is available in Settings > Providers > API Provider, listed before Anthropic, OpenAI, OpenRouter, Google Gemini, and other major providers.
• Usage: deepseek-v4-pro / deepseek-v4-flash are selectable in the model picker and used to run real coding tasks.

ToCodex also supports MCP tools, custom modes, scheduled tasks, BYOK, OpenAI-compatible providers, local models, and configurable model routing for agentic coding workflows.

Evidence screenshots:

1. DeepSeek V4 Pro is shown as the first model card on the official ToCodex website.

2. DeepSeek appears in the onboarding provider selector.

3. DeepSeek appears in the Settings > Providers API provider list.

4. DeepSeek V4 models (deepseek-v4-pro / deepseek-v4-flash) are selectable in the model picker and used to run tasks in ToCodex.

Links:

• Project: https://tocodex.com
• Open source: https://github.com/tocodex-ai/tocodex-community
• Download: https://tocodex.com/download.html