🧹 Refactor register_canvas_schemas function to improve maintainability

[Tcode-Motion]

🎯 What:
The register_canvas_schemas function in compiler/semantic/src/dsl_schema.rs was overly long (188 lines), violating codebase conventions and reducing readability.

💡 Why:
By extracting the registrations into smaller, logically grouped helper functions, the code becomes easier to read, navigate, and maintain. Future modifications or additions to the canvas module schema logic will be less error-prone and isolated to their specific domain.

✅ Verification:

• Ran cargo fmt --all to ensure the codebase remains formatted according to project standards.
• Executed cargo test --workspace to guarantee that all unit and integration tests passed, verifying that identical functionality is retained (e.g. schemas are populated identically).

✨ Result:
The register_canvas_schemas function is now clean and concise, simply delegating the setup tasks to specialized helper functions: register_canvas_shape_schemas, register_canvas_text_schemas, and register_canvas_misc_schemas.

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PR created automatically by Jules for task 15273645371357354115 started by @Tcode-Motion

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