chore(deps): delete stale package-lock.json (was v3.4.0 vs package.json v3.12.0) (#61)

The repo-tracked package-lock.json declared "version": "3.4.0" while
package.json is at v3.12.0 — 8 minor versions of drift. Since
package.json has zero dependencies (only built-in node:sqlite, node:http,
node:https), the lockfile carried no useful information. It was pure
noise that would mislead anyone running `npm ci` into thinking they were
installing v3.4.0.

Verification:
- package.json has no `dependencies` or `devDependencies` field (grep -A2 '"dependencies"' package.json → no match).
- Fresh clone + checkout + `npm install` → exit 0, "audited 1 package in 93ms, found 0 vulnerabilities".
- node_modules is correctly empty after install (no bin shims to relink).

Refs: audit side-finding 1 of 4.

Co-authored-by: dtzp555 <dtzp555@gmail.com>
Co-authored-by: Claude Opus 4.7 <noreply@anthropic.com>

package-lock.json

@@ -1,20 +0,0 @@
-{
-  "name": "openclaw-claude-proxy",
-  "version": "3.4.0",
-  "lockfileVersion": 3,
-  "requires": true,
-  "packages": {
-    "": {
-      "name": "openclaw-claude-proxy",
-      "version": "3.4.0",
-      "license": "MIT",
-      "bin": {
-        "ocp": "ocp",
-        "openclaw-claude-proxy": "server.mjs"
-      },
-      "engines": {
-        "node": ">=18"
-      }
-    }
-  }
-}