docs: add provider hub and model provider pages

docs/providers/zai.md

@@ -0,0 +1,34 @@
+---
+summary: "Use Z.AI (GLM models) with Clawdbot"
+read_when:
+  - You want Z.AI / GLM models in Clawdbot
+  - You need a simple ZAI_API_KEY setup
+---
+# Z.AI
+
+Z.AI is the API platform for **GLM** models. It provides REST APIs for GLM and uses API keys
+for authentication. Create your API key in the Z.AI console. Clawdbot uses the `zai` provider
+with a Z.AI API key.
+
+## CLI setup
+
+```bash
+clawdbot onboard --auth-choice zai-api-key
+# or non-interactive
+clawdbot onboard --zai-api-key "$ZAI_API_KEY"
+```
+
+## Config snippet
+
+```json5
+{
+  env: { ZAI_API_KEY: "sk-..." },
+  agents: { defaults: { model: { primary: "zai/glm-4.7" } } }
+}
+```
+
+## Notes
+
+- GLM models are available as `zai/<model>` (example: `zai/glm-4.7`).
+- See [/providers/glm](/providers/glm) for the model family overview.
+- Z.AI uses Bearer auth with your API key.