feat: add Moonshot AI (Kimi) provider and update xAI Grok models (#1953)

- Add comprehensive Moonshot AI provider with 11 models including:
  * Legacy moonshot-v1 series (8k, 32k, 128k context)
  * Latest Kimi K2 models (K2 Preview, Turbo, Thinking)
  * Vision-enabled models for multimodal capabilities
  * Auto-selecting model variants

- Update xAI provider with latest Grok models:
  * Add Grok 4 (256K context) and Grok 4 (07-09) variant
  * Add Grok 3 Mini Beta and Mini Fast Beta variants
  * Update context limits to match actual model capabilities
  * Remove outdated grok-beta and grok-2-1212 models

- Add MOONSHOT_API_KEY to environment configuration
- Register Moonshot provider in service status monitoring
- Full OpenAI-compatible API integration via api.moonshot.ai
- Fix TypeScript errors in GitHub provider

🤖 Generated with [Claude Code](https://claude.ai/code)

Co-authored-by: Claude <noreply@anthropic.com>

app/lib/modules/llm/registry.ts

@@ -16,6 +16,7 @@ import XAIProvider from './providers/xai';
 import HyperbolicProvider from './providers/hyperbolic';
 import AmazonBedrockProvider from './providers/amazon-bedrock';
 import GithubProvider from './providers/github';
+import MoonshotProvider from './providers/moonshot';
 
 export {
   AnthropicProvider,
@@ -26,6 +27,7 @@ export {
   HuggingFaceProvider,
   HyperbolicProvider,
   MistralProvider,
+  MoonshotProvider,
   OllamaProvider,
   OpenAIProvider,
   OpenRouterProvider,