fix(action): 修正 composite step 環境變數傳遞

action.yml

@@ -12,12 +12,10 @@ outputs:
     value: ${{ steps.antigravity.outputs.text }}
 runs:
   using: 'composite'
-  env:
-    OAUTH: ${{ secrets.ANTIGRAVITY_OAUTH }}
-    MODEL: ${{ vars.ANTIGRAVITY_MODEL }}
-    PROMPT: ${{ inputs.prompt }}
   steps:
   - name: 安裝工具
+    env:
+      OAUTH: ${{ secrets.ANTIGRAVITY_OAUTH }}
     run: |
       curl -fsSL https://antigravity.google/cli/install.sh | bash
       echo "$HOME/.local/bin" >> "$GITHUB_PATH"
@@ -29,6 +27,9 @@ runs:
     shell: bash
   - name: 執行工具
     id: antigravity
+    env:
+      MODEL: ${{ vars.ANTIGRAVITY_MODEL }}
+      PROMPT: ${{ inputs.prompt }}
     run: |
       text="$(agy --print "$PROMPT" --model "$MODEL")"
       printf '%s\n' "$text"