Add standalone repo scaffolding (README, packaging, CI)

Adds the release/CI machinery bos-settings already has in its own repo:
Forgejo package.yml (tag -> build -> publish to [breadway]) and
mirror.yml (Forgejo -> GitHub). PKGBUILD updated for the flattened
layout and dropped -p breadhelp now that this isn't a workspace member.

.gitignore

@@ -0,0 +1,34 @@
+# Rust build artifacts
+/target/
+**/*.pdb
+
+# Editor / IDE
+.vscode/
+.idea/
+*.swp
+*.swo
+*~
+.direnv/
+
+# OS artifacts
+.DS_Store
+Thumbs.db
+desktop.ini
+
+# Environment / secrets
+.env
+.env.local
+*.env.*
+secrets/
+*.pem
+*.key
+*.p12
+
+# Runtime / logs
+*.log
+logs/
+*.pid
+*.sock
+
+# Claude Code local agent state
+.claude/