feat: Migrate to ultrathin monolith architecture

Consolidate 3 separate applications (reports-app, data-entry-app, telegram-bot) into a unified
architecture with single backend and frontend:

Backend Changes:
- Unified FastAPI backend at backend/ with modular structure
- Modules: reports, data_entry, telegram in backend/modules/
- Centralized config.py and main.py with all routers registered
- Single worker mode (--workers 1) for Telegram bot compatibility
- Shared Oracle connection pool and JWT authentication
- Unified requirements.txt and environment configuration

Frontend Changes:
- Single Vue.js SPA with module-based routing
- Unified frontend at src/ with modules in src/modules/{reports,data-entry}/
- Shared components and stores in src/shared/
- Error boundaries for module isolation
- Dual API proxy in Vite for module communication

Infrastructure:
- New unified startup scripts: start-prod.sh, start-test.sh, start-backend.sh
- Environment templates: .env.dev.example, .env.test.example, .env.prod.example
- Updated deployment scripts for Windows IIS
- Simplified SSH tunnel management

Documentation:
- Comprehensive CLAUDE.md with architecture overview
- Module-specific docs in docs/{data-entry,telegram}/
- Architecture decision records in docs/ARCHITECTURE-DECISIONS.md
- Deployment guides consolidated in deployment/windows/docs/

This migration reduces complexity, improves maintainability, and enables easier
deployment while maintaining all existing functionality.

🤖 Generated with [Claude Code](https://claude.com/claude-code)

Co-Authored-By: Claude Sonnet 4.5 <noreply@anthropic.com>

backend/requirements.txt

@@ -0,0 +1,93 @@
+# ============================================================================
+# ROA2WEB Unified Backend - Dependencies
+# ============================================================================
+# Merged from reports-app, data-entry-app, and telegram-bot
+# All three modules now run in a single backend process
+
+# ============================================================================
+# FASTAPI CORE (Common to all modules)
+# ============================================================================
+fastapi>=0.109.0
+uvicorn[standard]>=0.27.0
+python-multipart>=0.0.6
+pydantic>=2.5.3
+pydantic-settings>=2.1.0
+email-validator>=2.1.0
+
+# ============================================================================
+# AUTHENTICATION (Shared across all modules)
+# ============================================================================
+PyJWT>=2.8.0
+python-jose[cryptography]>=3.3.0
+
+# ============================================================================
+# DATABASE - ORACLE (Shared: Reports + Data Entry nomenclatures + Auth)
+# ============================================================================
+oracledb>=2.0.1
+
+# ============================================================================
+# DATABASE - SQLITE (Data Entry + Telegram + Reports Cache)
+# ============================================================================
+aiosqlite>=0.19.0
+
+# ============================================================================
+# DATABASE - SQLMODEL + ALEMBIC (Data Entry only)
+# ============================================================================
+sqlmodel>=0.0.14
+sqlalchemy[asyncio]>=2.0.25
+alembic>=1.13.1
+
+# ============================================================================
+# HTTP CLIENT (Shared)
+# ============================================================================
+httpx>=0.27.0
+
+# ============================================================================
+# UTILITIES (Shared)
+# ============================================================================
+python-dotenv>=1.0.0
+python-dateutil>=2.8.2
+
+# ============================================================================
+# FILE HANDLING (Data Entry)
+# ============================================================================
+aiofiles>=23.2.1
+Pillow>=10.2.0
+
+# ============================================================================
+# REPORTS MODULE - Exports (Excel, PDF)
+# ============================================================================
+openpyxl>=3.1.0
+fpdf2>=2.7.0
+
+# ============================================================================
+# DATA ENTRY MODULE - OCR Dependencies
+# ============================================================================
+# PaddleOCR for receipt text extraction
+paddleocr>=2.7.0
+paddlepaddle>=2.5.0
+opencv-python>=4.8.0
+pytesseract>=0.3.10
+pdf2image>=1.16.0
+numpy>=1.24.0
+
+# ============================================================================
+# TELEGRAM MODULE - Bot SDK
+# ============================================================================
+python-telegram-bot>=20.7
+
+# ============================================================================
+# TELEGRAM MODULE - Email (SMTP for 2FA)
+# ============================================================================
+aiosmtplib>=3.0.0
+
+# ============================================================================
+# MONITORING (Optional - Telegram module)
+# ============================================================================
+# sentry-sdk>=1.40.0  # Uncomment if needed
+
+# ============================================================================
+# TESTING
+# ============================================================================
+pytest>=8.0.0
+pytest-asyncio>=0.23.3