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/QUICK-ENV-REFERENCE.md

@@ -0,0 +1,102 @@
+# Quick Environment Reference
+
+## 🔒 SECURITY FIRST
+
+**All `.env*` files (except `.env*.example`) contain real credentials and are NEVER committed to git!**
+
+## 🚀 First-Time Setup
+
+```bash
+# 1. Copy template with real credentials
+cp backend/.env.prod.example backend/.env.prod
+
+# 2. Edit with YOUR credentials
+vim backend/.env.prod
+
+# 3. Fill in the placeholders:
+#    - ORACLE_PASSWORD
+#    - JWT_SECRET_KEY
+#    - AUTH_SESSION_SECRET
+#    - TELEGRAM_BOT_TOKEN
+#    - SMTP_PASSWORD
+
+# 4. Start production
+./start-prod.sh
+```
+
+## 📋 Daily Usage
+
+```bash
+# Production (uses .env.prod automatically)
+./start-prod.sh
+
+# Test Environment (uses .env.test automatically)
+./start-test.sh
+
+# Quick Restart (uses existing .env)
+./start-backend.sh restart
+```
+
+## ✏️ Changing Configuration
+
+```bash
+# 1. Edit the source file (NOT .env!)
+vim backend/.env.prod    # Production
+vim backend/.env.test   # Test
+
+# 2. Restart to apply changes
+./start-prod.sh
+```
+
+## 📁 Which File to Edit?
+
+| You Want To... | Edit This File |
+|----------------|----------------|
+| Change dev database password | `backend/.env.prod` |
+| Update test server settings | `backend/.env.test` |
+| Add new environment variable | Templates: `.env*.example` + your `.env.prod`/`.env.test` |
+| Create production config | Copy `.env.prod.example` to `.env.prod` and fill secrets |
+
+## 🔑 Generating Secrets
+
+```bash
+# For JWT_SECRET_KEY and AUTH_SESSION_SECRET
+python3 -c "import secrets; print(secrets.token_urlsafe(32))"
+```
+
+**Generate DIFFERENT secrets for each environment (dev, test, prod)!**
+
+## ⚠️ Important
+
+- **Never edit** `backend/.env` directly (it's auto-generated!)
+- **Always edit** `backend/.env.prod` or `.env.test`
+- **Never commit** `.env`, `.env.prod`, `.env.test`, `.env.prod`
+- **Only commit** `.env*.example` (templates with placeholders)
+- Restart after changes for them to take effect
+
+## 🛡️ Git Behavior
+
+| File | Git Status | Contains |
+|------|-----------|----------|
+| `.env.prod.example` | ✅ Committed | Template (placeholders) |
+| `.env.test.example` | ✅ Committed | Template (placeholders) |
+| `.env.prod.example` | ✅ Committed | Template (placeholders) |
+| `.env.example` | ✅ Committed | Generic template |
+| `.env.prod` | ❌ Ignored | **Real dev credentials** |
+| `.env.test` | ❌ Ignored | **Real test credentials** |
+| `.env.prod` | ❌ Ignored | **Real prod credentials** |
+| `.env` | ❌ Ignored | Auto-generated (current) |
+
+## ✅ Quick Check
+
+```bash
+# See what git will commit
+git status backend/.env*
+
+# Should show ONLY .env*.example files
+# If .env.prod or .env.test appear, they're NOT properly ignored!
+```
+
+## 📖 More Info
+
+See `backend/ENV-SETUP.md` for complete documentation.