v0.0.15: Fix SSR warning in client components

Removes misleading warning that appeared during Next.js SSR:
- Client components are initially rendered on server where window is undefined
- This is expected behavior and doesn't require a warning
- Now silently falls back to relative URLs during SSR
- Properly uses window.location.origin once hydrated on client

The hooks now work seamlessly in:
- Pure client-side apps
- Next.js with SSR/SSG
- Server components (with explicit serverURL)
- Client components (auto-detects after hydration)

🤖 Generated with [Claude Code](https://claude.ai/code)

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

package.json

@@ -1,6 +1,6 @@
 {
   "name": "@xtr-dev/payload-feature-flags",
-  "version": "0.0.14",
+  "version": "0.0.15",
   "description": "Feature flags plugin for Payload CMS - manage feature toggles, A/B tests, and gradual rollouts",
   "license": "MIT",
   "type": "module",