chore(repo): add LICENSE, CI workflow, and untrack local config

Public-repo hygiene now that the project is hosted on Forgejo:

- LICENSE: add the MIT text that pyproject.toml already declares.
- .forgejo/workflows/ci.yml: run the pytest suite on push/PR against
  Python 3.10 and 3.12, so regressions (e.g. the healthcheck port bug)
  get caught automatically.
- Untrack llama.cpp.config and gitignore it: it is a machine-specific
  runtime config that may later hold an api_key. The tracked template
  remains llama.cpp.config.example (copy it to get started).

Co-Authored-By: Claude Opus 4.8 <noreply@anthropic.com>

.gitignore

@@ -19,3 +19,7 @@ venv/
 
 # Runtime lock files
 *.lock
+
+# Local runtime config (machine-specific; may hold an api_key).
+# The tracked template is llama.cpp.config.example — copy it to get started.
+llama.cpp.config