Initial import of Shirobana bot backend

Include utility modules, shared channels, prompts, read-only skills, wardrobe memory and regression tests. Externalize legacy credentials and exclude private runtime state.

.gitignore

@@ -0,0 +1,64 @@
+# Credentials and private configuration
+.env
+.env.*
+!.env.example
+*.env
+*.pem
+*.key
+*.p12
+*.pfx
+*.json
+!*.example.json
+!bot-utility/prompts/lorebook.json
+mail-com-token
+*secrets*
+*private*
+!mail-bridge/com-private.example.json
+
+# Python and dependencies
+__pycache__/
+*.py[cod]
+.venv/
+venv/
+.pytest_cache/
+.mypy_cache/
+node_modules/
+
+# Persistent private state and generated content
+*.db
+*.db-*
+*.sqlite
+*.sqlite3
+*.sqlite3-*
+*.log
+*.bak
+*.bak.*
+*.tar
+*.tar.gz
+*.tgz
+*.zip
+*.pid
+bot-utility/data/
+bot-utility/chat/history/
+bot-utility/chat/memory/
+bot-utility/chat/status/
+bot-utility/chat/groups/
+bot-utility/bridges/accounts/
+bot-utility/ginkgostu/
+bot-utility/mail/
+bot-utility/jm/
+bot-utility/pixiv/
+bot-utility/setu/
+bot-utility/komari/
+bot-utility/live/
+bot-utility/cache/
+bot-utility/temp/
+bot-utility/stickers/
+bot-utility/sticker_library/
+*-test-results.txt
+*-tests.log
+
+# Editor and local operating system
+.idea/
+.vscode/
+.DS_Store