Fix TTS server status errors and startup warnings

- Fixed 'app is not defined' errors by using current_app
- Improved TTS health check to handle missing /health endpoint
- Fixed database trigger creation to be idempotent
- Added .env.example with all configuration options
- Updated README with security configuration instructions

.env.example

@@ -1,22 +1,73 @@
-# Example environment configuration for Talk2Me
-# Copy this file to .env and update with your actual values
+# Talk2Me Environment Configuration
+# Copy this file to .env and fill in your values
 
 # Flask Configuration
-SECRET_KEY=your-secret-key-here-change-this
+FLASK_ENV=development
+FLASK_SECRET_KEY=your-secret-key-here-change-in-production
+FLASK_DEBUG=False
 
-# Upload Configuration
-UPLOAD_FOLDER=/path/to/secure/upload/folder
+# Server Configuration
+HOST=0.0.0.0
+PORT=5005
 
-# TTS Server Configuration
-TTS_SERVER_URL=http://localhost:5050/v1/audio/speech
+# Database Configuration
+DATABASE_URL=postgresql://user:password@localhost:5432/talk2me
+REDIS_URL=redis://localhost:6379/0
+
+# Ollama Configuration
+OLLAMA_BASE_URL=http://localhost:11434
+OLLAMA_MODEL=gemma2:9b
+OLLAMA_LARGE_MODEL=gemma3:27b
+
+# TTS Configuration
+TTS_SERVER_URL=http://localhost:8000
 TTS_API_KEY=your-tts-api-key-here
 
-# CORS Configuration (for production)
-CORS_ORIGINS=https://yourdomain.com,https://app.yourdomain.com
-ADMIN_CORS_ORIGINS=https://admin.yourdomain.com
+# Security Configuration
+JWT_SECRET_KEY=your-jwt-secret-key-here
+JWT_ACCESS_TOKEN_EXPIRES=3600
+JWT_REFRESH_TOKEN_EXPIRES=2592000
 
-# Admin Token (for admin endpoints)
-ADMIN_TOKEN=your-secure-admin-token-here
+# Admin Configuration
+ADMIN_USERNAME=admin
+ADMIN_PASSWORD=change-this-password
+ADMIN_EMAIL=admin@example.com
 
-# Optional: GPU Configuration
-# CUDA_VISIBLE_DEVICES=0
+# Rate Limiting
+RATE_LIMIT_PER_MINUTE=60
+RATE_LIMIT_PER_HOUR=1000
+
+# Session Configuration
+SESSION_LIFETIME=86400
+SESSION_CLEANUP_INTERVAL=3600
+
+# Logging
+LOG_LEVEL=INFO
+LOG_FORMAT=json
+
+# CORS Configuration
+CORS_ORIGINS=http://localhost:3000,http://localhost:5005
+
+# Feature Flags
+ENABLE_ANALYTICS=true
+ENABLE_RATE_LIMITING=true
+ENABLE_SESSION_MANAGEMENT=true
+ENABLE_ERROR_TRACKING=true
+
+# Performance Settings
+MAX_CONTENT_LENGTH=16777216
+REQUEST_TIMEOUT=300
+WHISPER_MODEL=base
+WHISPER_DEVICE=auto
+
+# Email Configuration (Optional)
+SMTP_HOST=smtp.gmail.com
+SMTP_PORT=587
+SMTP_USER=your-email@example.com
+SMTP_PASSWORD=your-email-password
+SMTP_FROM=noreply@example.com
+
+# External Services (Optional)
+SENTRY_DSN=
+DATADOG_API_KEY=
+NEWRELIC_LICENSE_KEY=