docs: add provider hub and model provider pages

docs/providers/anthropic.md

@@ -0,0 +1,62 @@
+---
+summary: "Use Anthropic Claude via API keys or Claude CLI auth in Clawdbot"
+read_when:
+  - You want to use Anthropic models in Clawdbot
+  - You want setup-token or Claude CLI auth instead of API keys
+---
+# Anthropic (Claude)
+
+Anthropic builds the **Claude** model family and provides access via an API.
+In Clawdbot you can authenticate with an API key or reuse **Claude Code / Claude CLI**
+credentials (setup-token or OAuth).
+
+## Option A: Anthropic API key
+
+**Best for:** standard API access and usage-based billing.
+Create your API key in the Anthropic Console.
+
+### CLI setup
+
+```bash
+clawdbot onboard
+# choose: Anthropic API key
+
+# or non-interactive
+clawdbot onboard --anthropic-api-key "$ANTHROPIC_API_KEY"
+```
+
+### Config snippet
+
+```json5
+{
+  env: { ANTHROPIC_API_KEY: "sk-ant-..." },
+  agents: { defaults: { model: { primary: "anthropic/claude-opus-4-5" } } }
+}
+```
+
+## Option B: Claude CLI (setup-token or OAuth)
+
+**Best for:** using your Claude subscription or existing Claude CLI login.
+
+### CLI setup
+
+```bash
+# Run setup-token on the gateway host (wizard can run it for you)
+clawdbot onboard --auth-choice setup-token
+
+# Reuse Claude CLI OAuth credentials if already logged in
+clawdbot onboard --auth-choice claude-cli
+```
+
+### Config snippet
+
+```json5
+{
+  agents: { defaults: { model: { primary: "anthropic/claude-opus-4-5" } } }
+}
+```
+
+## Notes
+
+- The wizard can run `claude setup-token` on the gateway host and store the token.
+- Auth details + reuse rules are in [/concepts/oauth](/concepts/oauth).