Reorder stages: scripts before uv-projects

Swap stage 06 and 07 so that custom scripts (Bitwarden SSH loader,
custom binaries) are deployed before git clone operations that
need SSH keys.

- Renamed 06-uv-projects.sh → 07-uv-projects.sh
- Renamed 07-scripts.sh → 06-scripts.sh
- Updated provision.sh STAGES array and README
- Updated stage reference numbers in 08-systemd and 09-desktop
- Removed mempi-sync.timer (not needed without automated refresh)

provision.sh

@@ -42,8 +42,8 @@ STAGES=(
   "03-toolchains"     # nvm, Node, uv, Python
   "04-shell"          # Zsh, oh-my-zsh, p10k
   "05-git"            # Git config, SSH
-  "06-uv-projects"    # Clone + install Julian's Python tools
-  "07-scripts"        # ~/.local/bin custom scripts
+  "06-scripts"        # ~/.local/bin custom scripts (bw, bw-load-ssh, etc.)
+  "07-uv-projects"    # Clone + install Julian's Python tools (needs SSH keys from stage 06)
   "08-systemd"        # User systemd services
   "09-desktop"        # Keybindings, hotkeys, desktop config
   "10-docker"         # Docker CE