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dbcake — single-file DB + secrets client

Features:
 - centralized (.dbce append-only) and decentralized (per-key files) storage
 - choose storage format: binary | bits01 | dec | hex
 - encryption modes (low|normal|high) with AES-GCM via cryptography if installed;
   secure stdlib fallback otherwise
 - key rotation, file-locking, CLI, interactive passphrases
 - API to switch modes: db.centerilized() and db.decentralized()
 - Server sync (push/pull) implemented with urllib (no extra libs)
 - Graphical package installer (tkinter) to install optional packages (e.g., cryptography)
 - Secrets HTTP client (Client/AsyncClient) with optional Fernet encryption

Author: Cielecon