#11285 fix: keep devbox ble cache parity

Keep the shared devbox image aligned with the Blaxel template after the ble.sh cache bake landed.

• seed all four TERM caches in the E2B/Daytona Dockerfile and Freestyle replay
• copy the per-HOME cache seed before ble.sh starts
• bump the image epoch and test all provider paths

Focused verification: bun test --isolate web/tests/vm-devbox-image.test.ts.

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Summary by cubic

Keeps the devbox image's ble.sh cache behavior aligned with the Blaxel template so the first shell in a pane no longer prints an "updating tput cache" line or pays the tput walk.

• Seeds ble.sh's per-TERM tput caches for xterm-256color, screen-256color, tmux-256color, and linux in the Dockerfile and Freestyle builder.
• Marks the seed and cache fallback directories world-readable so fresh non-root users can read them.
• Copies the baked caches into each user's writable XDG cache before ble.sh starts, refreshing missing or stale entries against init-term.sh via an atomic tmp-file-and-rename so a failed copy never corrupts an existing cache.
• Bumps CMUX_IMAGE_EPOCH so remote builders pick up the new layers.
• Adds a test asserting all providers bake and seed the same cache set.

Summary by CodeRabbit

• Performance Improvements

  • Faster interactive shell startup through pre-seeded terminal compatibility caches.
  • Added support for xterm, screen, tmux, and Linux terminal environments.
  • Ensured consistent cache setup across devbox image builds and shell sessions.

• Bug Fixes

  • Reduced delays and initialization issues when opening shell sessions.
  • Improved reliability and safety when updating terminal cache files.

• Tests

  • Added coverage to verify consistent terminal cache setup across supported devbox image providers.