chore: native repository conversion — remove FreeCAD/GitHub artifacts (#367)

- Delete .github/ directory (60 files, ~4600 lines of unused GitHub
  Actions workflows, FreeCAD-branded issue/PR templates, problem
  matchers, scripts, and images)
- Delete .packit.yaml (Fedora COPR packaging, unused)
- Delete SECURITY.md (FreeCAD-specific security policy)
- Update .pre-commit-config.yaml to remove .github file pattern
- Update .gitignore to remove .github/ whitelist
- Rewrite CODE_OF_CONDUCT.md for Kindred Create community
- Rewrite PRIVACY_POLICY.md covering Silo integration, update
  checker, origin system, and local storage

Gitea equivalents (.gitea/workflows/, .gitea/ISSUE_TEMPLATE/,
.gitea/pull_request_template.md) are already in place.

Closes #367

CODE_OF_CONDUCT.md

@@ -1,8 +1,8 @@
-# FreeCAD Project Code of Conduct
+# Kindred Create Code of Conduct
 
 ## Statement
 
-The FreeCAD Project community covers people from a wide variety of countries,
+The Kindred Create community includes people from a wide variety of countries,
 backgrounds and positions. This global diversity is a great strength of the
 project, but can also lead to communication issues, which may in turn cause
 unhappiness. To maximise happiness of the project community taken as a whole,
@@ -55,12 +55,13 @@ further defined and clarified by project maintainers.
 ## Enforcement
 
 Instances of abusive, harassing, or otherwise unacceptable behavior may be
-reported by contacting any of the community admins or moderators at
-https://forum.freecad.org/memberlist.php?mode=team . All
-complaints will be reviewed and investigated and will result in a response that
-is deemed necessary and appropriate to the circumstances. The project team is
-obligated to maintain confidentiality with regard to the reporter of an incident.
-Further details of specific enforcement policies may be posted separately.
+reported by opening an issue at
+https://git.kindred-systems.com/kindred/create/issues or by contacting the
+Kindred Systems project maintainers directly. All complaints will be reviewed
+and investigated and will result in a response that is deemed necessary and
+appropriate to the circumstances. The project team is obligated to maintain
+confidentiality with regard to the reporter of an incident. Further details
+of specific enforcement policies may be posted separately.
 
 Project maintainers who do not follow or enforce the Code of Conduct in good
 faith may face temporary or permanent repercussions as determined by other