feat(rego): add React-to-Go Template DSL for email generation

[pcfreak30]

• Add comprehensive Go template component library (@lumeweb/rego)
• Supports GoVar, GoIf, GoRange, GoWith, GoDefine, GoUseTemplate, GoBlock
• Add data transformation helpers (GoDate, GoCurrency, GoTruncate)
• Add string transformations (GoUpperCase, GoLowerCase, GoTrim)
• Add pipeline chaining and variable assignment (GoPipe, GoLet, GoFormat)
• Add URL generation (GoUrl) and array operations (GoChunk)
• Add conditional helpers (GoEqual, GoEmpty) and comments (GoComment)
• Include comprehensive documentation and examples
• Add full test coverage

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This pull request introduces the @lumeweb/rego library, a React-to-Go Template DSL designed for email generation. The library provides a set of React components that wrap React Email elements and output HTML embedded with Go template syntax. This enables developers to design and style emails using React while allowing Go backends to execute the templates with runtime data.

Key functional capabilities include:

• Core Template Logic: Components for variable interpolation (GoVar), conditional rendering (GoIf, GoElse, GoEqual, GoEmpty), loop iteration (GoRange), and context switching (GoWith).
• Template Composition: Support for defining reusable template blocks (GoDefine, GoUseTemplate, GoBlock) to create modular email layouts.
• Data Transformation: Helpers for formatting data such as dates (GoDate), currency (GoCurrency), and text truncation (GoTruncate).
• String Manipulation: Components for transforming text case and trimming whitespace (GoUpperCase, GoLowerCase, GoTrim).
• Helper Functions: Utilities for embedding Go template syntax directly into JSX attributes (e.g., goVar, goUrl, goDate) to handle dynamic links and inline content.

[pcfreak30]

@kody start-review

[kody-ai]

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