Rename product to Synapse; add Gitea CI, VPS deploy templates, RPM build fixes

Rebrands user-facing product identity from Logseq to Synapse (package
metadata, Electron appId/protocol scheme, Android/iOS display names, HTML
titles, and the English UI dictionary), authored by Darío Sevilla
<dario@dariosevilla.es>. Internal Clojure namespaces, :logseq.class/*
and :logseq.property/* DB schema idents, and deps.edn's upstream git
dependency coordinates are intentionally left untouched -- those are
either persisted data in existing graphs or point at real upstream repos,
and renaming them has no user-visible benefit.

Also:
- .gitea/workflows/build.yml: Linux (AppImage/deb/rpm), Windows (nsis),
  and Android (debug APK) build jobs.
- deploy/: systemd unit + Caddyfile templates for a self-hosted VPS
  (daemon on loopback, Caddy reverse-proxies /v1/*, /mcp, /healthz and
  serves the static web client with TLS).
- gulpfile.js / prepare-desktop-runtime-js.mjs: LOGSEQ_SKIP_CLI_BUNDLE
  skips the cli/ OCaml package (no toolchain in this environment) instead
  of failing the build; LOGSEQ_ELECTRON_BUILDER_ARGS lets CI override the
  packaged Linux targets independently of the local default.
- resources/electron-builder.yml: drop the extraResources entry for a
  SKILL.md that doesn't exist in this fork, and the author.email fix
  needed for the rpm/deb targets' Packager/Maintainer metadata.

.gitignore

@@ -35,6 +35,7 @@ cli/_opam/
 *.log
 .vscode/
 .idea/
+.claude/
 
 # Python sidecar
 sidecar/.venv/