v0.1.0 of fl_env

Secure environment variable management for Flutter. CLI-encrypted .env files, decrypted natively at runtime — no plaintext at rest in the compiled binary. Changelog excerpt: ### New features - CLI tool: fl_env setup, keygen, build, scan, check, inspectcommands. - fl_env build: Encrypts all .envtier values with AES-256-GCM (HKDF-SHA256 key derivation) and writes a binary registry (fl_env_registry.bin/ FlEnvRegistry.bin) plus a binary key file (fl_env_key.bin/ FlEnvKey.bin) into the consumer's own app module. Resources are written to android/app/src/main/res/raw/and ios/Runner/by default — the consumer's directories, not the plugin[...]