Configure .gitignore for Next.js frontend (Step 10 prep)

[Copilot]

Step 10 assumes a Next.js frontend exists at src/frontend/ for final verification. The frontend hasn't been created yet (Steps 1-9 incomplete). This PR configures the .gitignore structure in preparation.

Changes

• Root .gitignore: Added Next.js build artifact patterns

  # Next.js Frontend (src/frontend)
  src/frontend/node_modules/
  src/frontend/.next/
  src/frontend/out/
  src/frontend/.env*.local
  src/frontend/.vercel

• src/frontend/.gitignore: Created with standard Next.js excludes (node_modules, .next, out, .env*.local, etc.)

• Documentation: Added setup instructions (src/frontend/README.md) and status tracking (STEP10_STATUS.md)

What's Blocked

Without the Next.js application:

• Production build verification (npm run build)
• E2E testing (gods list, search, CRUD operations)
• Browser console checks

Next Actions

Create the Next.js app in src/frontend/, then return to complete Step 10's build and testing requirements. See STEP10_STATUS.md for full prerequisites.

Original prompt

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This section details on the original issue you should resolve

<issue_title>Verify .gitignore and Final Checks</issue_title>
<issue_description># Step 10: Verify .gitignore and Final Checks

Description

Ensure that generated files, dependencies, and build artifacts from the Next.js project are properly excluded from version control. Perform a final end-to-end verification of the complete setup.

Implementation Steps

1. Check src/frontend/.gitignore — The create-next-app scaffold generates a .gitignore that should already include:

   node_modules/
   .next/
   out/
   .env*.local
   

   Verify these entries exist. If not, add them.

2. Check root .gitignore — Ensure the root .gitignore does not conflict with or override the frontend .gitignore. Optionally add these entries to the root file as well:

   src/frontend/node_modules/
   src/frontend/.next/
   src/frontend/.env.local
   

3. Run a full production build:

   cd src/frontend && npm run build

   Fix any TypeScript errors, lint warnings, or build failures.

4. End-to-end manual testing — With both services running:

   • Open http://localhost:3000/gods — verify the gods list loads.
   • Use the search bar to search for a god name (e.g., "Thor") — verify results appear.
   • Toggle "Include Aliases" and search again — verify alias-based results.
   • Click a god to view details — verify all fields and aliases display.
   • Click "Edit" on a god — verify the form is pre-populated.
   • Submit the edit — verify the changes persist and the detail page updates.
   • Click "Add God" — verify the empty form renders with the mythology dropdown.
   • Submit a new god — verify it appears in the list.
   • Delete a god from the list or detail page — verify it is removed.

5. Check for console errors — Open browser DevTools and confirm there are no CORS errors, unhandled promise rejections, or React hydration mismatches.

Files Modified

• .gitignore (root, if needed)
• src/frontend/.gitignore (if entries are missing)

Acceptance Criteria

• node_modules/, .next/, and .env.local are excluded from git tracking.
• npm run build succeeds with zero errors.
• All CRUD operations work end-to-end in the browser.
• No errors in the browser console.
• The application is ready for further development or deployment.
  </issue_description>

Comments on the Issue (you are @copilot in this section)

• Fixes Verify .gitignore and Final Checks #12

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