Add OpenDental integration detection script

[Gumbees]

Summary

Adds an OpenDental integration-detection script that scans an endpoint for OpenDental third-party integrations and writes findings back to NinjaRMM via custom fields (CUSTOM_FIELD_UNSUPPORTED_FOUND, CUSTOM_FIELD_APPS_FOUND). All configuration reads from environment variables per the canonical RMM-variable convention.

Files touched:

• app-opendental/opendental-detect-integrations.ps1 ... new detection script (+365 lines)

Test plan

• Run on an OpenDental workstation with known integrations (e.g. Yapi, Dexis) and confirm the integration list is populated correctly.
• Verify env-var reads work when invoked via NinjaRMM with CUSTOM_FIELD_UNSUPPORTED_FOUND and CUSTOM_FIELD_APPS_FOUND set.
• Confirm the script writes back to the configured custom field names without overwriting unrelated data.

Lineage

Part of the stale-branch reconciliation sweep. The original branch carried sweep-shaped edits to CLAUDE.md codifying the env-var convention; those were dropped during rebase because PR #50 already landed the env-var convention canonically. Only the new OpenDental script remains.

[claude]

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