fix: skip dev dependencies in CI install step (#919)

Use `bun install --production` instead of `bun install` in both
action.yml and base-action/action.yml to skip installing devDependencies
(@types/*, prettier, typescript) that are not needed at runtime.

Bun runs TypeScript natively without needing the typescript compiler
or type definition packages. This reduces installed packages from 151
to 135 and speeds up the install step.

Fixes #895

Co-authored-by: Dave-London <hello@os4us.org>
Co-authored-by: Claude Opus 4.6 <noreply@anthropic.com>

base-action/action.yml

@@ -116,7 +116,7 @@ runs:
       shell: bash
       run: |
         cd ${GITHUB_ACTION_PATH}
-        bun install
+        bun install --production
 
     - name: Install Claude Code
       shell: bash