refactor(auth): modularize login hook and remove duplicate schema

[saifulalomdev]

📝 Description

This PR finalizes the architectural co-location of the authentication module. It shifts the login state hook directly into the auth domain and eliminates legacy global files to prevent structural drift.

Key Changes:

• Domain Co-location: Renamed and migrated src/hooks/use-log-in.ts into src/modules/auth/auth.hooks.ts to keep feature hooks local.
• Dead Code Elimination: Deleted the deprecated global schema file src/schema/login.ts in favor of the unified src/modules/auth/auth.schema.ts.
• Component State Realignment: Updated the LogInForm UI component to use the localized hook imports and swapped out the variable references from isPending to isLoading to match the core useAction hook interface.

Fixes # (issue number)

🧪 Type of Change

• Bug fix (non-breaking change which fixes an issue)
• New feature (non-breaking change which adds functionality)
• Breaking change (fix or feature that would cause existing functionality to not work as expected)
• Refactor / Chore (codebase maintenance or optimization)

🛠️ How Has This Been Tested?

• Verified local authentication form input handling against the updated auth.schema.ts rules.

• Confirmed submission UI states (Loading spinners and active/disabled buttons) toggle smoothly using the aligned isLoading state.

• Checked project compilation to ensure no broken or stale import path aliases remain.

• Unit/Integration tests added/passed

• Local manual edge verification successful

📸 Screenshots / Diffs (if applicable)

File tracking:

• Deleted: src/schema/login.ts
• Moved & Updated: src/hooks/use-log-in.ts ➔ src/modules/auth/auth.hooks.ts
• Updated: src/modules/auth/components/login.tsx

✅ Checklist

• My code follows the brutalist/minimal style guidelines of this project
• I have performed a self-review of my own code
• My changes generate no new typescript compiler or linter errors