Remove eager DB access in proxy AppConfig.ready()

[Copilot]

geonode.proxy was calling proxy_urls_registry.initialize() inside AppConfig.ready(), triggering a DB query at startup and causing Django to emit a RuntimeWarning about database access during app initialization.

The registry already supports lazy initialization — get_proxy_allowed_hosts() re-initializes automatically when the cache is empty or stale — so there's no need to eagerly populate it at boot.

Changes

• geonode/proxy/apps.py: Remove run_setup_hooks() and its try/except wrapper. Wire Link post-save/post-delete signal handlers directly in ready() (no DB access required).
• geonode/proxy/utils.py: Remove _first_init flag and signal-connection code from initialize() — signals are now owned by AppConfig.ready(). Drop the unused signals import.

# Before: DB hit at every startup
def ready(self):
    super().ready()
    try:
        proxy_urls_registry.initialize()  # queries DB
    except Exception:
        post_migrate.connect(run_setup_hooks, sender=self)

# After: no DB access; signals wired cleanly; registry initializes lazily on first use
def ready(self):
    super().ready()
    from geonode.base.models import Link
    signals.post_save.connect(link_post_save, sender=Link)
    signals.post_delete.connect(link_post_delete, sender=Link)

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