Add configuration template files (.env.example, .dockerignore)

Added essential configuration templates that were missing from the
repository due to overly restrictive .gitignore patterns.

Changes to .gitignore:
- Added negation patterns for .env.example files
- Added negation patterns for .dockerignore files
- These are safe template files with placeholder values

Files added:
- .env.example (root): Main environment configuration template
- reports-app/backend/.env.example: Backend configuration template
- reports-app/frontend/.env.example: Frontend configuration template
- reports-app/telegram-bot/.env.example: Telegram bot config template
- reports-app/telegram-bot/.dockerignore: Docker build exclusions

These template files help developers quickly set up their local
development environment by copying and customizing them.

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

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

.env.example

@@ -0,0 +1,112 @@
+# ROA2WEB Environment Variables Configuration
+# Copy this file to .env and update with your actual values
+
+# =============================================================================
+# ORACLE DATABASE CONFIGURATION
+# =============================================================================
+
+# Oracle database connection
+ORACLE_USER=your_oracle_username
+ORACLE_PASSWORD=your_oracle_password
+ORACLE_DSN=your_oracle_connection_string
+
+# Oracle Instant Client Path (local development only)
+INSTANTCLIENTPATH=/path/to/oracle/instantclient
+
+# Database Connection Pool Settings
+DB_MIN_CONNECTIONS=2
+DB_MAX_CONNECTIONS=10
+DB_CONNECTION_INCREMENT=1
+
+# =============================================================================
+# JWT AUTHENTICATION CONFIGURATION
+# =============================================================================
+
+# JWT Secret Key - CHANGE THIS IN PRODUCTION!
+# Generate a secure key: python -c "import secrets; print(secrets.token_urlsafe(32))"
+JWT_SECRET_KEY=your-super-secret-jwt-key-change-in-production
+
+# JWT Algorithm
+JWT_ALGORITHM=HS256
+
+# Token Expiration Settings
+ACCESS_TOKEN_EXPIRE_MINUTES=30
+REFRESH_TOKEN_EXPIRE_DAYS=7
+
+# =============================================================================
+# AUTHENTICATION SETTINGS
+# =============================================================================
+
+# User data cache TTL (minutes)
+AUTH_CACHE_TTL_MINUTES=15
+
+# Rate Limiting Settings
+RATE_LIMIT_MAX_REQUESTS=5
+RATE_LIMIT_TIME_WINDOW=300
+
+# =============================================================================
+# LOGGING CONFIGURATION
+# =============================================================================
+
+# Log Level (DEBUG, INFO, WARNING, ERROR, CRITICAL)
+LOG_LEVEL=INFO
+
+# =============================================================================
+# FASTAPI APPLICATION SETTINGS
+# =============================================================================
+
+# FastAPI Development Settings
+FASTAPI_HOST=127.0.0.1
+FASTAPI_PORT=8000
+FASTAPI_RELOAD=true
+
+# CORS Settings
+CORS_ORIGINS=["http://localhost:3000", "http://localhost:5173", "http://localhost:8080"]
+
+# =============================================================================
+# VUE.JS FRONTEND SETTINGS
+# =============================================================================
+
+# API Base URL for Vue.js frontend
+VUE_APP_API_URL=http://localhost:8000
+
+# Vue.js Development Server
+VUE_DEV_PORT=3000
+
+# =============================================================================
+# DOCKER CONFIGURATION
+# =============================================================================
+
+# Docker Compose Settings
+COMPOSE_PROJECT_NAME=roa2web
+
+# Nginx Gateway Port
+NGINX_PORT=8080
+NGINX_SSL_PORT=8443
+
+# =============================================================================
+# PRODUCTION DEPLOYMENT
+# =============================================================================
+
+# Environment (development, staging, production)
+ENVIRONMENT=development
+
+# Security Settings
+SECURE_SSL_REDIRECT=false
+SESSION_COOKIE_SECURE=false
+CSRF_COOKIE_SECURE=false
+
+# Database Connection Timeout
+DB_CONNECTION_TIMEOUT=30
+
+# =============================================================================
+# MONITORING & OBSERVABILITY
+# =============================================================================
+
+# Metrics and Monitoring
+ENABLE_METRICS=false
+METRICS_PORT=9090
+
+# Health Check Settings
+HEALTH_CHECK_TIMEOUT=10
+HEALTH_CHECK_INTERVAL=30