Rebrand PuppetDB -> OpenVoxDB in docs and comments

[silug]

Pull Request (PR) description

Rebrand user-facing product references, modeled on OpenVoxProject/openvox PR #530:

• PuppetDB -> OpenVoxDB, Puppet -> OpenVox, Puppet Server -> OpenVox Server, Facter -> OpenFact in documentation prose, code comments, Clojure docstrings, CLI help text, and log/error message wording (src/, puppet/ terminus, resources/ext/cli helpers, ext/ and ci/ dev tooling, acceptance harness step names).
• Documentation links moved from puppet.com/docs/{puppetdb,puppet,puppetserver} to https://docs.openvoxproject.org/{openvoxdb,openvox,openvox-server}/latest/. Source/issue links in overview and install-from-source now point at github.com/OpenVoxProject/openvoxdb.
• Dropped or neutralized Puppet Enterprise notes where they implied this product ships with PE (install notes, PE init-script paths, PE console dashboard note, pe-client-tools install/config sections).
• Fixed "a OpenVox..." -> "an OpenVox..." grammar.
• Updated test assertions that match reworded runtime messages (core_test, migration_coordination_test, terminus_failover, puppet specs) and ext/ test scripts that grep startup/upgrade log lines.

Remove PE-only features from the docs (verified against the code):

• ha.markdown and the /pdb/ext/v1 endpoint docs (no sync, ext, or RBAC code exists in this codebase), plus their nav entries
• [sync] settings section, PDB_EXT_INTERRUPT_LINGERING_SYNC_PULL, and the RBAC-token curl instructions
• PE-only corrective-change subdivisions of event counts (store-corrective-change? is never enabled outside tests); document corrective_change fields as always null
• Reports /resources child endpoint examples (route does not exist)
• Reword the packages endpoint banner to describe the package_inventory wire-format mechanism instead of PE

Make package and module references consistent:

• puppet-openvoxdb module (openvoxdb::* classes) everywhere new installs are described; forge.puppet.com with https
• openvoxdb / openvoxdb-termini package names in install, upgrade, and connect instructions (the puppetdb service name is unchanged)

Remove stale content:

• Update-checker references (setting and code no longer exist), the pre-6.8 manual delete-reports SQL, migration FAQs already dropped, dead tickets.puppetlabs.com links in live docs (GitHub issues where a tracker link is needed), downloads.puppetlabs.com pointers (replaced with GitHub releases), PL-internal CI docs for pipelines that do not exist in this repo, ext/bin/tag-release, ext/bin/analyze-index-usage, and the unreferenced ext/project_data.yaml

Also update the pot metadata (Vox Pupuli copyright with Puppet, Inc. attribution, GitHub issues as the bug address) and regenerate it, and fix the dashboard "OpenvoxDB" capitalization.

Deliberately unchanged: namespaces, protocols/records, API routes and wire formats, PQL name and syntax, config file/section names, service/user names, file paths, terminus and puppet.conf snippets, executable names, metric/MBean/logger names, env vars, artifact coordinates, sample wire data, LICENSE/NOTICE, CHANGELOG/HISTORY and release notes, pre-fork historical references, and 'Puppet' when it names the language (Puppet code/manifests/modules/classes) or upstream products.

Assisted by Claude Code

This Pull Request (PR) fixes the following issues

N/A

[cvquesty]

That took a minute.

LGTM