refactor: migrate to a new template-based database generation system

[teetangh]

• Removed legacy database generation scripts and replaced them with a new template-based approach for generating RLS policies and database triggers.
• Introduced separate generators for policies and triggers, enhancing maintainability and organization.
• Updated README and documentation to reflect the new structure and usage instructions.
• Ensured all SQL content is now organized in reusable templates for better clarity and collaboration.

[gemini-code-assist]

Summary of Changes

Hello @teetangh, I'm Gemini Code Assist¹! I'm currently reviewing this pull request and will post my feedback shortly. In the meantime, here's a summary to help you and other reviewers quickly get up to speed!

This pull request significantly refactors the database generation process by introducing a new template-based system. This change aims to improve the maintainability, organization, and clarity of RLS policies and database triggers. By separating generation logic from SQL content and utilizing reusable templates, the system becomes more robust and easier to manage, while also removing outdated legacy scripts.

Highlights

• Database Generation Refactor: The entire database generation system has been migrated to a new template-based approach, replacing legacy scripts for RLS policies and database triggers.
• Separated Generators: Policy and trigger generation logic is now handled by distinct, dedicated generator classes (PolicyGenerator and TriggerGenerator), improving modularity and maintainability.
• Template-Driven SQL: All SQL content for policies and triggers is now managed through reusable templates, enhancing clarity, collaboration, and ease of modification.
• Legacy Code Removal: Obsolete database generation scripts and associated documentation from the scripts/supabase/legacy directory have been removed.
• Enhanced Policy Dropping: The policy generator now includes expanded logic to drop a wider range of policy naming patterns, ensuring cleaner policy re-application.
• Schema Grants Added: A new schema_grants.sql template has been introduced to explicitly grant necessary schema and table permissions to anon and authenticated roles, preventing common permission errors.
• Updated App Naming: References to 'Familiarise App' in comments and descriptions have been updated to 'Elluminar App'.

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[gemini-code-assist]

Code Review

This is a great refactoring that significantly improves the database generation process by migrating to a template-based system. The separation of concerns between Dart logic and SQL templates enhances maintainability and clarity. The removal of legacy scripts and the addition of comprehensive schema grants are excellent improvements. I've found one area with some code duplication that could be addressed to fully align with the new template-based approach.