fix(openclaw-gateway): make claimedApiKeyPath configurable per agent

The openclaw_gateway adapter hardcodes the Paperclip API key path to
~/.openclaw/workspace/paperclip-claimed-api-key.json in buildWakeText().
In multi-agent OpenClaw deployments, each agent has its own workspace
with its own key file. The hardcoded path forces all agents to share
one key, breaking agent identity isolation.

Add a claimedApiKeyPath field to the adapter config (with UI input)
that allows operators to set a per-agent path. Falls back to the
current default when unset — zero behavior change for existing
deployments.

Fixes #930

ui/src/adapters/openclaw-gateway/config-fields.tsx

@@ -150,6 +150,16 @@ export function OpenClawGatewayConfigFields({
             />
           </Field>
 
+          <Field label="Claimed API key path">
+            <DraftInput
+              value={eff("adapterConfig", "claimedApiKeyPath", String(config.claimedApiKeyPath ?? ""))}
+              onCommit={(v) => mark("adapterConfig", "claimedApiKeyPath", v || undefined)}
+              immediate
+              className={inputClass}
+              placeholder="~/.openclaw/workspace/paperclip-claimed-api-key.json"
+            />
+          </Field>
+
           <Field label="Session strategy">
             <select
               value={sessionStrategy}