Add Arabic-first real estate valuation review assistant prototype

[Moshbbab]

Motivation

• Provide a lightweight, Arabic‑first RTL prototype that helps Saudi valuation reviewers validate appraisal reports and iterate on UX quickly.
• Focus on a simple, practical workflow (upload, extract/paste text, detect IVS/IFRS 13 gaps, flag unsupported assumptions, export summary) rather than full production integrations.
• Keep architecture minimal so the prototype is easy to extend into extraction/AI steps later.

Description

• Add a new Vite React + TypeScript + Tailwind app under prototype/valuation-review-assistant including package.json, vite.config.ts, and tsconfig.json.
• Implement the main UI and logic in src/App.tsx with PDF upload metadata, pasted extracted-text input, IVS and IFRS 13 element detection, missing-item checklist, unsupported-assumptions detection, confidence/risk indicators, and Word export (.doc) output.
• Include RTL entrypoint and styling via index.html, src/styles.css, tailwind.config.js, and postcss.config.js, plus a short README.md with npm install / npm run dev instructions.

Testing

• Ran go test ./... which reported unrelated failing tests in the existing repository (internal/config tests TestMigrationWriteErrors failed).
• Ran make lint which failed because there is no lint target in this repository/environment (no lint step executed).

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Codex Task