Initial commit: linux-provision repo

Distribution-agnostic provisioning script that sets up a new Linux machine
(Detected via lib/distro.sh - supports Debian/Ubuntu/Pop and Fedora families).

13 stages covering:
- System packages, external repos, toolchains (nvm, uv, Python)
- Shell config (zsh, oh-my-zsh, p10k), git, SSH
- Custom uv tools from ~40 git repos
- Desktop config (keybindings, hotkeys, ghostty, fonts)
- Docker, system tweaks, browser/app installs
- Custom systemd user services (porridge, swayidle, mempi-sync, etc.)
- API keys loaded from Bitwarden at shell startup

config/systemd/bw-ssh-keys.service

@@ -0,0 +1,13 @@
+[Unit]
+Description=Load Bitwarden SSH keys into ssh-agent
+After=network-online.target
+Wants=network-online.target
+
+[Service]
+Type=oneshot
+ExecStart=%h/.local/bin/bw-load-ssh.sh
+Restart=on-failure
+RestartSec=30
+
+[Install]
+WantedBy=default.target