默认使用default构建模板

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The issue title suggests changing the default build template to 'default' in the pocket-cocos project, which interfaces Cocos Creator with Pocket Factory. Start by examining the build configuration files and template selection logic in the codebase. Look for where build templates are defined and how the default is set. Determine what 'done' looks like by verifying that the build system correctly uses the specified default template without breaking existing functionality.

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