Restore tracked source and establish deterministic CI

[d33pm3]

Summary

• restore the application src/ and public/ trees as normal tracked files
• recover the missing chatData.ts module and referenced logo verbatim from repository history
• remove the redundant Codebase.zip and ZIP-dependent setup instructions
• add a Bun 1.2.23 validate job for frozen install, lint, tests, and production build
• scope ESLint compatibility exceptions to the exact legacy files that need them and convert the Tailwind plugin config to ESM
• document that all seeded records are fictional synthetic demo fixtures

Root cause

main had no workflow and no tracked src/ tree. A clean build failed at /src/main.tsx; after restoring the current archive, the build then proved that src/data/chatData.ts and src/assets/ecxo-logo.png were also omitted from that archive. Both omitted files were recovered from the repository's earlier source ZIP commit.

Validation

• bun install --frozen-lockfile
• bun run lint — 0 errors, 7 non-blocking Fast Refresh warnings
• bun run test — 1 passed, 0 failed
• bun run build
• GitHub Actions push run: https://github.com/d33pm3/Multi-agent-Full-Stack-App/actions/runs/34117489621

The source scan found no .env* files, credentials, API keys, tokens, private keys, connection strings, real phone numbers, or non-example email addresses. The chatbot and administration surfaces remain local UI simulations; CI makes no live LLM/API calls.