Point sync workflow at TemplateMarket edge function

[CarmenDou]

Summary

• Re-points the registry sync workflow from api.insforge.dev/admin/v1/templates/sync (cloud-backend Express controller) to p8n7m7ci.us-east.insforge.app/functions/sync-templates (TemplateMarket InsForge project's edge function).
• The TemplateMarket project (c6366c10-…) now owns the templates table, RPCs, and sync logic; cloud-backend will drop its template.controller.ts + 073_template_marketplace.sql migration in a follow-up.
• Repo TEMPLATE_SYNC_TOKEN secret has been rotated to match the value stored on the TemplateMarket project — manual sync smoke-tested 200 with synced=7.

Test plan

• Workflow run on merge to main (the sync path filters apply) returns HTTP 200
• templates table row count on TemplateMarket project matches registry.json length
• Once cloud-backend drops its endpoint, no other workflow / consumer still hits api.insforge.dev/admin/v1/templates/sync

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Summary by cubic

Points the registry sync workflow to TemplateMarket’s edge function at https://p8n7m7ci.us-east.insforge.app/functions/sync-templates, replacing https://api.insforge.dev/admin/v1/templates/sync. Sync now targets the TemplateMarket project; the repo TEMPLATE_SYNC_TOKEN was rotated accordingly.

^{Written for commit 1c55733. Summary will update on new commits. Review in cubic}

[cubic-dev-ai]

No issues found across 1 file

_{Re-trigger cubic}

[jwfing]

LGTM, approved.