Simplify initialization code by removing redundant operations

[cfuehrmann]

Summary

Simplifies initialization code by removing redundant operations and unnecessary wrapper functions.

Changes

• Remove redundant create_dir_all: Directory is guaranteed to exist after create_data_files succeeds
• Remove template accessor methods: Use template constants directly instead of wrapper functions

Rationale

Directory Creation:
The create_schemas function is called after create_data_files in the initialization flow. Since create_data_files writes files directly to the output directory, the directory must already exist for those writes to succeed.

Template Accessors:
The get_recipe_template() and get_ingredient_template() functions were simple wrappers around constants with no additional logic, making them unnecessary indirection.

Benefits

• Cleaner, more direct code
• Fewer function calls and indirection
• Same functionality with less complexity

All 36 tests pass, confirming no behavioral changes.