refactor: remove src directory and update config paths

[francescopausellii]

The PR introduces a cleaner and lighter starting architecture compared to the original src directory, and also moves the core authentication logic of better-auth to a more shared location

[gemini-code-assist]

Summary of Changes

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This pull request streamlines the project's directory structure by eliminating the src folder, promoting a flatter file hierarchy. This change simplifies module resolution and path management throughout the codebase. Additionally, it centralizes authentication-related logic into a dedicated lib/auth directory, enhancing code organization and maintainability for authentication features.

Highlights

• Directory Structure Refactor: The top-level src directory has been removed, flattening the project's file hierarchy and making the project root the primary reference point for modules.
• Configuration Updates: Configuration files including .oxfmtrc.json, drizzle.config.ts, and tsconfig.json were updated to reflect the new file paths and alias mappings.
• Import Path Adjustments: Numerous import statements across various files were updated to align with the new, flatter directory structure and consolidated lib/auth paths.
• Authentication Module Reorganization: Authentication-related utility files, previously under src/features/auth/lib, have been consolidated into a new lib/auth directory for improved modularity.

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[gemini-code-assist]

Code Review

This pull request primarily refactors import paths across the codebase, including updates to configuration files like .oxfmtrc.json, drizzle.config.ts, and tsconfig.json, reflecting a likely change in the project's directory structure and consolidation of authentication-related files. A critical performance issue was identified in app/page.tsx, where importing useSession from lib/auth/client.ts violates Rule 2.1 (bundle-barrel-imports) of the repository's style guide. This barrel file import can unnecessarily increase bundle size by including unused client-side authentication functions, and it is recommended to refactor for more granular imports to optimize tree-shaking.

[cecco25]

• Format vitest.config.mts
• Update README to match current architecture