feat: v3.4.0 — OpenPanel plugin public release (42 tools)

OpenPanel product analytics plugin fully reviewed, tested, and published.
Works with both self-hosted and cloud (openpanel.dev) instances.

- 42 tools: event tracking, data export, analytics, project/client management
- All tools use public REST APIs (Track, Export, Insights, Manage)
- Client modes: write (tracking), read (analytics), root (full access)
- Service page with description, setup notes, WordPress plugin download
- Dynamic URL hints in Add Site form
- 62 unit tests
- ENABLED_PLUGINS default now includes openpanel

Co-Authored-By: Claude Opus 4.6 (1M context) <noreply@anthropic.com>

server.py

@@ -66,8 +66,6 @@ from core.dashboard.routes import (
     api_get_config,
     api_list_keys,
     api_list_sites,
-    # K.5: Settings routes
-    api_save_setting,
     api_test_site,
     api_update_site,
     # E.2: OAuth Social Login routes
@@ -109,6 +107,8 @@ from core.dashboard.routes import (
     # F.3: Service pages
     dashboard_service_page,
     dashboard_services_list,
+    # K.5: Settings routes
+    api_save_setting,
     dashboard_settings_page,
     # E.3: Site Management pages
     dashboard_sites_add,