feat: add DynamicDataProvider and TemplateBuilder

[Potatomonsta]

Description

• Add shared template utilities for nested data extraction and placeholder processing
• Introduce DynamicDataProvider model/parser and DynamicDataScope for scoped fetched data
• Introduce TemplateBuilder model/parser for data-driven child generation from lists or direct JSON
• Wire DynamicDataProvider/TemplateBuilder into StacService resolution and parser registry
• Refactor movie_app home_screen to use DynamicDataProvider + TemplateBuilder instead of raw JSON itemTemplate

Type of Change

• New feature (non-breaking change which adds functionality)
• Bug fix (non-breaking change which fixes an issue)
• Breaking change (fix or feature that would cause existing functionality to change)
• Code refactor
• Build configuration change
• Documentation
• Chore

[coderabbitai]

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✨ Finishing Touches

🧪 Generate unit tests (beta)

• Create PR with unit tests
• Post copyable unit tests in a comment
• Commit unit tests in branch mn/dsl-templatable

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