feat(db): mesh data model — meshes, members, invites, audit log

- pgSchema "mesh" with 4 tables isolating the peer mesh domain
- Enums: visibility, transport, tier, role
- audit_log is metadata-only (E2E encryption enforced at broker/client)
- Cascade on mesh delete, soft-delete via archivedAt/revokedAt

Co-Authored-By: Claude Opus 4.6 (1M context) <noreply@anthropic.com>

.context/turbostarter-framework-context/sections/ai/docs/xai.md

@@ -0,0 +1,90 @@
+---
+title: xAI Grok
+description: Setup xAI provider and learn how to use it in the starter kit.
+url: /ai/docs/xai
+---
+
+# xAI Grok
+
+The [xAI](https://x.ai) provider integrates Grok models into your application using the AI SDK.
+
+![xAI Grok](/images/docs/ai/providers/xai.webp)
+
+## Setup
+
+<Steps>
+  <Step>
+    ### Generate API Key
+
+    Visit the [xAI website](https://x.ai) to create an account. After signing in, navigate to your account settings to generate an API key.
+  </Step>
+
+  <Step>
+    ### Add API Key to Environment
+
+    Once you've acquired an API key, add it to your project's `.env` file (e.g., in `apps/web`):
+
+    ```bash title=".env"
+    XAI_API_KEY=your-api-key
+    ```
+  </Step>
+
+  <Step>
+    ### Configure Provider (Optional)
+
+    The starter kit automatically uses the `XAI_API_KEY` environment variable. For advanced configurations and customization options, refer to the comprehensive [AI SDK xAI documentation](https://sdk.vercel.ai/providers/ai-sdk-providers/xai#provider-instance).
+  </Step>
+</Steps>
+
+## Features
+
+<Cards>
+  <Card title="Chat Models" href="https://sdk.vercel.ai/providers/ai-sdk-providers/xai#language-models">
+    Utilize xAI's language models for conversational AI, text generation, and
+    other natural language processing tasks.
+  </Card>
+
+  <Card title="Tool Usage / Function Calling" href="https://sdk.vercel.ai/providers/ai-sdk-providers/xai#tool-usage--function-calling">
+    Enable language models to interact with external tools and functions,
+    allowing for more complex and automated task execution.
+  </Card>
+
+  <Card title="Image Generation" href="https://sdk.vercel.ai/providers/ai-sdk-providers/xai#image-models">
+    Generate images based on textual descriptions using xAI's models.
+  </Card>
+</Cards>
+
+## Use Cases
+
+<Cards>
+  <Card title="AI Chatbot">
+    Create intelligent chatbots that engage users in natural, informative
+    conversations powered by xAI's Grok models, delivering responsive and
+    contextually relevant interactions. Experience this capability in our [Chat
+    Demo](/ai/docs/chat).
+  </Card>
+
+  <Card title="Content Generation">
+    Produce diverse, high-quality text content across various formats and
+    styles, harnessing the unique characteristics and capabilities of Grok
+    models for creative and informational outputs.
+  </Card>
+
+  <Card title="Automated Workflows">
+    Streamline operations by connecting xAI's language models with your existing
+    tools through function calling, enabling sophisticated automation of complex
+    business processes and repetitive tasks.
+  </Card>
+
+  <Card title="Image Generation">
+    Design striking visuals and artwork directly from text descriptions using
+    xAI's image generation capabilities, enabling creative applications and rich
+    visual content. Explore our [Image Generation Demo](/ai/docs/image) to see
+    these features in action.
+  </Card>
+</Cards>
+
+## Links
+
+* [xAI Website](https://x.ai)
+* [AI SDK - xAI Provider Docs](https://sdk.vercel.ai/providers/ai-sdk-providers/xai)