fix(setup): decouple OpenClaw config patch from being mandatory

OCP markets itself as a standalone OpenAI-compatible proxy with six
supported IDE clients (Cline / Cursor / Continue.dev / OpenCode / Aider /
OpenClaw). The README §Server Setup says "node setup.mjs" is the
installer entrypoint. But on a truly fresh box without OpenClaw
installed, setup.mjs hard-fails at line 111:

    if (!existsSync(CONFIG_PATH)) fail(`OpenClaw config not found...`);

This contradicts the standalone-proxy stance and was caught during
PR #71 dogfood testing on Pi231.

Root cause: the OpenClaw config patch (lines 110-148) was baked in as
required because OCP started life as an OpenClaw-internal helper. The
project has since rebranded to standalone OCP without decoupling the
installer.

Fix: gate the OpenClaw config patch (Step 2) and auth-profiles patch
(Step 3) on existsSync(CONFIG_PATH). When OpenClaw is present, behavior
is byte-for-byte identical to current main (verified via dry-run hash
diff against ~/.openclaw/openclaw.json — UNCHANGED). When OpenClaw is
absent, the installer logs a graceful warning, skips both patch
sections, and continues to start.sh / launchd-plist / systemd-unit
creation as before. The summary banner is also conditional: when
OpenClaw is absent, it points the user at README § "Client Setup"
instead of giving openclaw.json edit instructions.

Also moves `import { readdirSync }` from mid-file (line 178, post-use)
to the top-level imports block; this was a latent ESM-hoisting quirk
that worked but is now syntactically required at the top because the
readdirSync call moved inside an `if` block.

Out of scope (Iron Rule 11, single-layer PR): server.mjs, models.json,
scripts/sync-openclaw.mjs, README.md, ALIGNMENT.md, package.json
version, the duplicate-spawn / health-verify logic at line 268+ (that's
a separate fix/setup-spawn-conflict PR).

Mac mini production unaffected: ~/.openclaw/openclaw.json already
exists there, so the OpenClaw-present path is preserved. `ocp update`
doesn't invoke setup.mjs, so running services are not touched.

Smoke-tested locally:
- Path 1 (OpenClaw present): dry-run output functionally identical to
  current main; config sha256 unchanged after run.
- Path 2 (OpenClaw absent, OPENCLAW_STATE_DIR=/tmp/no-such-dir-*):
  graceful warn, both patch sections skipped, banner shows
  standalone-mode message, dry-run completes successfully.
- npm test: 43/43 pass.

Co-Authored-By: Claude Opus 4.7 <noreply@anthropic.com>

setup.mjs

@@ -12,7 +12,7 @@
  *   4. Creates start.sh for easy launch
  *   5. Optionally starts the proxy
  */
-import { readFileSync, writeFileSync, existsSync, mkdirSync, unlinkSync } from "node:fs";
+import { readFileSync, writeFileSync, existsSync, mkdirSync, unlinkSync, readdirSync } from "node:fs";
 import { execSync } from "node:child_process";
 import { join, dirname } from "node:path";
 import { homedir } from "node:os";
@@ -107,11 +107,18 @@ try {
   warn("Make sure you're logged in: claude login");
 }
 
-// Check openclaw config
+// Check openclaw config (optional — OCP runs standalone without OpenClaw)
-if (!existsSync(CONFIG_PATH)) fail(`OpenClaw config not found at ${CONFIG_PATH}`);
+const OPENCLAW_PRESENT = existsSync(CONFIG_PATH);
+if (OPENCLAW_PRESENT) {
   log(`OpenClaw config: ${CONFIG_PATH}`);
+} else {
+  warn(`OpenClaw not detected at ${CONFIG_PATH} — skipping OpenClaw integration.`);
+  warn(`To register OCP with OpenClaw later, install OpenClaw and re-run \`node setup.mjs\`,`);
+  warn(`or run \`ocp update\` if OpenClaw is installed afterward.`);
+}
 
 // ── Step 2: Patch openclaw.json ─────────────────────────────────────────
+if (OPENCLAW_PRESENT) {
   console.log("\n📝 Configuring OpenClaw...\n");
 
   const config = readJSON(CONFIG_PATH);
@@ -175,8 +182,6 @@ const agentDirs = existsSync(agentsDir)
       })
     : [];
 
-import { readdirSync } from "node:fs";
-
   for (const agentId of agentDirs) {
     const apPath = join(agentsDir, agentId, "agent", "auth-profiles.json");
     try {
@@ -208,6 +213,7 @@ for (const agentId of agentDirs) {
   if (agentDirs.length === 0) {
     warn("No agent auth-profiles.json found — you may need to restart the gateway first");
   }
+}
 
 // ── Step 4: Create start.sh ─────────────────────────────────────────────
 console.log("\n🚀 Creating launcher...\n");
@@ -238,31 +244,46 @@ if (!DRY_RUN) {
 log(`Launcher: ${startPath}`);
 
 // ── Step 5: Summary ─────────────────────────────────────────────────────
-console.log(`
+const banner = [
-╔══════════════════════════════════════════════════════════════╗
+  `╔══════════════════════════════════════════════════════════════╗`,
-║                  Setup complete!                             ║
+  `║                  Setup complete!                             ║`,
-╠══════════════════════════════════════════════════════════════╣
+  `╠══════════════════════════════════════════════════════════════╣`,
-║                                                              ║
+  `║                                                              ║`,
-║  Provider: ${PROVIDER_NAME.padEnd(44)}║
+  `║  Provider: ${PROVIDER_NAME.padEnd(44)}║`,
-║  Port:     ${String(PORT).padEnd(44)}║
+  `║  Port:     ${String(PORT).padEnd(44)}║`,
-║  Models:   ${`see models.json (${MODELS.length} available)`.padEnd(44)}║
+  `║  Models:   ${`see models.json (${MODELS.length} available)`.padEnd(44)}║`,
-║  Default:  ${DEFAULT_MODEL_ID.padEnd(44)}║
+  `║  Default:  ${DEFAULT_MODEL_ID.padEnd(44)}║`,
-║                                                              ║
+  `║                                                              ║`,
-║  Start proxy:                                                ║
+  `║  Start proxy:                                                ║`,
-║    bash ${startPath.replace(HOME, "~").padEnd(50)}║
+  `║    bash ${startPath.replace(HOME, "~").padEnd(50)}║`,
-║                                                              ║
+  `║                                                              ║`,
-║  Or directly:                                                ║
+  `║  Or directly:                                                ║`,
-║    node ${serverPath.replace(HOME, "~").padEnd(49)}║
+  `║    node ${serverPath.replace(HOME, "~").padEnd(49)}║`,
-║                                                              ║
+  `║                                                              ║`,
-║  Set as default model in openclaw.json:                      ║
+];
-║    agents.defaults.model.primary =                           ║
+if (OPENCLAW_PRESENT) {
-║      "${PROVIDER_NAME}/${DEFAULT_MODEL_ID}"${" ".repeat(Math.max(0, 30 - PROVIDER_NAME.length - DEFAULT_MODEL_ID.length))}║
+  banner.push(
-║                                                              ║
+    `║  Set as default model in openclaw.json:                      ║`,
-║  Then restart gateway:                                       ║
+    `║    agents.defaults.model.primary =                           ║`,
-║    openclaw gateway restart                                  ║
+    `║      "${PROVIDER_NAME}/${DEFAULT_MODEL_ID}"${" ".repeat(Math.max(0, 30 - PROVIDER_NAME.length - DEFAULT_MODEL_ID.length))}║`,
-║                                                              ║
+    `║                                                              ║`,
-╚══════════════════════════════════════════════════════════════╝
+    `║  Then restart gateway:                                       ║`,
-`);
+    `║    openclaw gateway restart                                  ║`,
+    `║                                                              ║`,
+  );
+} else {
+  banner.push(
+    `║  OpenClaw not detected — running in standalone mode.         ║`,
+    `║  Point your IDE (Cline / Cursor / Continue / OpenCode /      ║`,
+    `║  Aider / OpenClaw) at:                                       ║`,
+    `║    http://${BIND_ADDRESS}:${String(PORT)}/v1${" ".repeat(Math.max(0, 47 - BIND_ADDRESS.length - String(PORT).length))}║`,
+    `║                                                              ║`,
+    `║  See README § "Client Setup" for per-IDE instructions.       ║`,
+    `║                                                              ║`,
+  );
+}
+banner.push(`╚══════════════════════════════════════════════════════════════╝`);
+console.log("\n" + banner.join("\n") + "\n");
 
 // ── Step 6: Optionally start ────────────────────────────────────────────
 if (!SKIP_START && !DRY_RUN) {