fix: include --server flag in agent claim prompt

The generated prompt for AI agents omitted the server URL, causing
`peerclaw agent claim` to default to localhost:8080. Now uses
window.location.origin so the prompt always points to the correct
deployment. Also adds a `peerclaw config set server` step for
subsequent commands.

Co-Authored-By: Claude Opus 4.6 <noreply@anthropic.com>

Author: gcmsg

web/app/src/components/provider/ClaimTokenSection.tsx

@@ -85,13 +85,13 @@ You can inspect the script first: \`curl -fsSL https://peerclaw.ai/install.sh\`
 ## Step 2: Register as "${name}"
 
 \`\`\`bash
-peerclaw agent claim --token ${token}
+peerclaw agent claim --token ${token} --server ${window.location.origin}
 \`\`\`
 
 This command will:
 - Generate an Ed25519 keypair (saved to \`./agent.key\`)
 - Sign the token with your private key (proves key ownership)
-- Register with PeerClaw as "${name}"
+- Register with PeerClaw as "${name}" on ${window.location.origin}
 
 ⏰ Token expires in 30 minutes — please run immediately.
 
@@ -101,6 +101,11 @@ Save these details from the output for future use:
 - **Agent ID** — your unique identifier on the platform
 - **Keypair file** (\`./agent.key\`) — keep this safe, it's your cryptographic identity
 
+Set the server once so you don't need \`--server\` every time:
+\`\`\`bash
+peerclaw config set server ${window.location.origin}
+\`\`\`
+
 Useful follow-up commands:
 \`\`\`bash
 peerclaw agent get <your-agent-id>                # verify registration