🧹 [code health improvement] Refactor dsl_to_html in web.rs

[Tcode-Motion]

🎯 What: The code health issue addressed was the excessively long and complex dsl_to_html function in stdlib/src/web.rs. It consisted of a massive inline match block spanning hundreds of lines.
💡 Why: Breaking down the massive match block into dedicated helper functions like render_website and render_page drastically improves code maintainability. It reduces cyclomatic complexity, isolates logic for rendering different DSL blocks, and eliminates duplicated block traversal logic via the new render_children function.
✅ Verification: I validated the changes by compiling the workspace and successfully running all tests, specifically cargo test -p techscript_stdlib and cargo test --workspace. The behavior is preserved precisely as the components were simply lifted into helper functions.
✨ Result: The dsl_to_html function is now clean, readable, and properly delegates specialized rendering logic to dedicated helper functions.

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PR created automatically by Jules for task 294185737966890269 started by @Tcode-Motion

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