chore: ignore local settings and runtime files

Exclude virtual environments, caches, logs, backups, custom logos and SQLite sidecar files.

.gitignore

@@ -0,0 +1,9 @@
+__pycache__/
+*.py[cod]
+.venv/
+server-settings.json
+logs/
+backups/
+*.sqlite3-wal
+*.sqlite3-shm
+database/site-logo.png